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We can also say that it is the wave in which the particles of the medium oscillate in a direction perpendicular to the direction of propagation of the wave. The entire NCERT textbook questions have been solved by best teachers for you. Can you hear the sound of the bell? Does it indicate that sound can travel through liquids? Dogs have the ability to hear it but humans cannot. 13.6(a)]. CBSE Class 8 Science Lessons Explanation, Notes, NCERT Question Answers, ← Force and Pressure Class 8 Notes, Question Answers, Explanation, Chemical Effects of Electric Current Class 8 Notes, Question Answers, Explanation →, Chapter 1 How, When and Where Class 8 History Explanation, Question Answers, Chapter 2 From Trade to Territory – The company establishes power Class 8 History, Explanation, Question Answers, Chapter 3 Ruling the Countryside Class 8 History Explanation, Question and Answers, Chapter 4 Tribals, Dikus and the Vision of a Golden Age Class 8 History Explanation, Chapter 5 When people rebel – 1857 and after Class 8 History Explanation, Chapter 6 Weavers Iron Smelters and Factory Owners Class 8 History, Explanation, Chapter 1 The Indian Constitution, Class 8 Civics Explanation, Question and Answers, Chapter 2 Understanding Secularism, Class 8 Civics Explanation, Question and Answers, Chapter 3 Why do we need a Parliament, Class 8 Civics Explanation, Question and Answers, Chapter 4 Understanding laws, Class 8 Civics Explanation, Question and Answers, Chapter 5 Judiciary Class 8 Civics Explanation, Question and Answers, Chapter 6 Understanding Our Criminal Justice System Class 8 Civics Explanation, Question and Answers, Chapter 7 Understanding Marginalization, Class 8 Civics Explanation, Question and Answers, Chapter 8 Confronting Marginalisation, Class 8 Civics Explanation, Question and Answers, Chapter 9 Public Facilities, Class 8 Civics Explanation, Question and Answers, Chapter 10 Law and Social Justice, Class 8 Civics Explanation, Question and Answers, Chapter 1 Resources, Class 8 Geography lesson Explanation, Question and Answers, Chapter 2 Land, Soil, Water, Natural Vegetation and Wildlife Resources, Class 8 Geography Lesson Explanation, Question and Answers, Chapter 3 Mineral and Power Resources, Class 8 Geography lesson Explanation, Question and Answers, Chapter 4 Agriculture, Class 8 Geography lesson Explanation, Question and Answers, Chapter 5 Industries, Class 8 Geography lesson Explanation, Question and Answers, Chapter 6 Human Resources, Class 8 Geography lesson Explanation, Question and Answers, Chapter 1 Crop Production and Management Class 8 CBSE Science Notes, Question Answers, Chapter 2 Microorganisms Class 8 Notes, Question Answers, Chapter 3 Synthetic fibres and Plastics Class 8 Notes, Question Answers, Chapter 4 Metals and Non Metals Class 8 Notes, Question Answers, Chapter 5 Coal and Petroleum Class 8 Notes, Question Answers, Chapter 6 Combustion and Flame Class 8 Notes, Question Answers, Chapter 7 Conservation of plants and animals Class 8 Notes, Question Answers, Chapter 8 Cell Structure and Function Class 8 Notes, Question Answers, Chapter 9 Reproduction Class 8 Notes, Question Answers, Explanation, Chapter 10 Reaching the age of adolescence Class 8 Notes, Question Answers, Explanation, Chapter 11 Force and Pressure Class 8 Notes, Question Answers, Explanation, Chapter 12 Friction Class 8 Notes, Question Answers, Explanation, Chapter 13 Sound Class 8 Notes, Question Answers, Explanation, Chapter 14 Chemical Effects of Electric Current Class 8 Notes, Question Answers, Explanation, Chapter 15 Some Natural Phenomena Class 8 Notes, Question Answers, Explanation, Chapter 16 Light Class 8 Notes, Question Answers, Explanation, Chapter 17 Stars and the Solar System Class 8 Explanation, Notes, Examples, Question Answers, Chapter 18 Pollution of Air and Water Class 8 Explanation, Notes, Examples, Question Answers, Chapter 1 Dhwani Class 8 Summary, Explanation, Question Answers, Chapter 2 Lakh Ki Chudiyan Class 8 Summary, Explanation, Question Answers, Difficult Words, Chapter 3 Bus Ki Yatra Class 8 Summary, Explanation, Question Answers, Chapter 4 Deewano ki Hasti Class 8 Summary, Explanation, Question Answers, Chapter 5 Chitthiyon Ki Anoothi Duniya Class 8 Summary, Explanation, Question Answers, Chapter 6 Bhagwan Ke Dakiye Class 8 Summary, Explanation, Question Answers, Chapter 7 Kya Nirash Hua Jaye Class 8 Summary, Explanation, Question Answers, Chapter 8 Yeh Sabse Kathin Samay Nahi Class 8 Summary, Explanation, Question Answers, Chapter 9 Kabir Ki Saakhiyaan Class 8 Summary, Explanation, Question Answers, Chapter 10 Kamchor Class 8 Summary, Explanation, Question Answers, Chapter 11 Jab Cinema Ne Bolna Sikha Class 8 Summary, Explanation, Question Answers, Chapter 12 Sudama Charit Class 8 Summary, Explanation, Question Answers, Chapter 13 Jahan Pahiya hai Class 8 Summary, Explanation, Question Answers, Chapter 14 Akbari Lota Class 8 Summary, Explanation, Question Answers, Chapter 15 Surdas ke Pad Class 8 Summary, Explanation, Question Answers, Chapter 16 Pani ki Kahani Class 8 Summary, Explanation, Question Answers, Chapter 17 Baaz aur Saanp Class 8 Summary, Explanation, Question Answers, Chapter 18 Topi Class 8 CBSE Hindi Lesson, Summary, Explanation, Question Answers, Entrance Exams for Arts students after Graduation, List of Entrance Exams conducted by IGNOU. There are different characteristics of sound which are as follows: It is a characteristic of sound, the degree of sensation of sound. Answer: The to and fro or back and forth motion of an object is called vibration. b) 20-20,000 Hz. Solution: Shrillness of a sound is determined by the …………….. of vibration. What is the time period of the vibration ? (c) its frequency is above 20 kHz. When ears receive sound, it enters the ear canal and reach ear drum. How many vibrations is it completing in one second ? of oscillation = 40 If the music is too loud, it becomes noise. Since sound can travel through water, the whales can communicate with each other. MCQ Questions for Class 8 Science with Answers were prepared based on the latest exam pattern. The SI unit is the same as that of density or pressure. [NCERT] The eardrum sends vibrations to the inner ear. Question:  List sources of noise pollution in your surroundings. Sound is a form of energy that produces sensation of hearing. The NCERT Science book is a single book and not divided into parts. 2. NCERT Solutions for Class 8 Science Chapter 13 Sound in English and Hindi Medium (Adhyay 13: Dhwani) to Study online or View in Video Format or download free in PDF file updated for academic session 2020-2021 following new CBSE Syllabus and based on new NCERT Books. Top. Children have very short vocal cords. (c) taking 1.5 seconds to complete one vibration. Answer: Ask your friends around you if they were able to hear the same sound? Thus when sound waves fall on the eardrum, it starts vibrating back and forth rapidly. Question 12. We can hear a pleasant sound. Sonogram is image of the internal organs. Music is a sound which produces a pleasing sensation. Answer: : 16 Subject : Science 2. 5. (c) Pitch NCERT Book for Class 8 Science Chapter 13 Sound is available for reading or download on this page. Question: On a stormy day, why lightning is seen first and thunder is heard later? 6. Answer: Question 4. What […] Take a metal or glass tumbler. Now blow air through the gap between them [Fig. Can sound travel through water ? Question 1. The larynx has a pair of membranes known as vocal cords stretched across their length. are represented by the upper portion of the curve called crest. It needs medium to travel. Answer: k.setAttribute("data-push", "1"); Sound needs a material medium for its propagation. MCS Year 8 Physics MCS Year 9 Physics iGCSE AS Physics A2 Physics AQA Physics A2 Exam Papers + Revision 2010 onwards Revision material Waynflete Stud. Answer: While hearing is the obvious function of the ear, it is the primary organ for our sense of balance as well. When we touch the pan gently with our finger after striking we feel the vibration. Required fields are marked *, About | Privacy Policy | Disclaimer | Sitemap. The amplitude of vibration of the tumbler is larger when the glass is struck hard.Thus the loudness of sound depends upon the amplitude of vibration. Question 12. Next Prev Home. Class 6 - Class 7 - Class 8 - Class 9 Class 10 - Class 11 - Class 12. MCQ Questions for Class 8 Science: Ch 13 Sound 02 Sept, 2020 MCQ Questions for Class 8 Science: Ch 13 Sound. MCS Year 8 Physics MCS Year 9 Physics iGCSE AS Physics A2 Physics AQA Physics A2 Exam Papers + Revision 2010 onwards Revision material Waynflete Stud. The vocal cords vibrate and produce sound. Identify the part which vibrates to produce sound in the following instruments. Identify laboratory tools Can music become noise sometimes? Larynx is also known as voice box. Vibration of an object is the necessary condition for the production of sound. ∴ Time period = 1/10 sec. ((w.adpushup = w.adpushup || {}).control = (w.adpushup.control || [])).push(k); On receiving the vibrations its fluid also starts vibrating and  sensory cells present in them transform the vibrations into electrical signals which are carried by auditory nerve to brain for interpretation and understanding. It is the speed with which sound travels. Answer: Your parents are going to buy a house. [NCERT], Question 5. ∴ No. Solving the NCERT exemplar Solutions class 8 science chapter 13 sound will help the students to understand the higher-order thinking questions as well as to score good marks in the exam. Sound can propagate More the frequency, more the voice is shrilled. 40 vibrations in 4 seconds. What is the hearing range of human ear? What happens when we pluck the strings of a sitar ? Answer: 5. Production of Sound: (i) Sound is produced due to the vibration of object. Answer: Time to check your knowledge by answering the following questions-, Mark the following statements as true or false-. Sound depends upon the amplitude of vibration, larger the amplitude of vibration the louder is the sound Higher the frequency of vibration, the higher is the pitch and shriller is the sound Unpleasant sounds are called noise, we should made attempts to minimise noise pollution as it is harmful for human beings 2. Answer: (d), Question 5. 2 3. Question 16. (a) Frequency The sound cannot travel through a vacuum. Animals produce a wide range of sounds. (c) A man. Answer: Flute uses air as the primary vibrating medium for the production of sound. Answer: The grain jump up and down because of the vibration caused underneath the stretched rubber. Top Time taken for 500 vibrations = 1 second [NCERT] Name the sound producing organ in human. Students who are in Class 8 or preparing for any exam which is based on Class 8 Science can refer NCERT Science Book for their preparation. Answer: Question 1. A pendulum oscillates 50 times in 6 seconds. Learn about the properties of sound waves and how we calculate the speed of sound with BBC Bitesize KS3 Science. Community laws must create silence zones near schools/ colleges, hospitals etc. Lower organisms use their wings to produce buzzing sound. Listen to the ring carefully. Frequency =10 vibrations/sec. These instruments are mainly made of brass and wood but sometimes they can be made of silver. The instruments with plucked strings have varied lengths. Frequency is expressed in hertz. Question 3. Answer: Sound needs a material like air, water, steel, etc. On the moon there is no atmosphere and sound cannot travel in vacuum. Answer: Outer part: It consist of ear pinna, auditory canal, and ear drum. Violin: Violin produces the sound of highest pitch. How ? Question 19. mrsmarshall. Answer: Question 8. (c) A man Answer: The harmful effects of noise pollution are as follows: Question: What is the difference between noise and music? 1 hertz is equal to (a) 1 vibration per minute (b) 10 vibrations per minute a) 200-2000 Hz. It depends upon amplitude. If the frequency of a sound is below 20 Hz, will it be audible to human beings ? Explain how the sound travels. It is the property that determines the shrillness (sharpness) or depth of sound. How is the pressure variation in a sound wave amplified in human ear ? (ii) The motion of materials or objects […] How can a hearing impaired child communicate ? Can you explain the change? A vibrating source transfers the vibrations to the surrounding medium, which can be solid, liquid or gaseous. A music player sound like guitar, violin, etc. Next Prev Home. Middle part: The middle ear is an air-filled cavity. : How whales and dolphins are able to communicate? In which case is the amplitude larger? Dogs can hear frequencies higher than 20,000 Hz. The more the amplitude of vibration, louder the sound. Sound: (i) Sound is a form of energy like heat energy, light energy, potential energy and kinetic energy. To limit noise pollution, we can instal silencing devices in aircraft engines, vehicles, etc. “Sound needs a medium for propagation”. A hearing impaired child can communicate effectively by using sign language. (c), Question 7. To examplify, w, hen a vibrating object moves forward, it pushes and. What is the difference between noise and music? Sound vibrations make the eardrum vibrate. Then Fill the bucket or bathtub with water. So, transfer of sound energy occurs faster. Answer: Question 13. are represented by the lower portion of the curve called trough. Samacheer Kalvi 9th Science Sound Additional Questions. (ii) Sound helps us communicate with each other. Sound is a kind of (a) work (b) energy (c) force (d) pressure (b) energy. Science - Class 8 / Grade 8 (Chapter 11 - 18) Chapter 13 – Sound – 1 NCERT Solutions for Class 8 Science PDF free download, NCERT Solutions for Class 8 Science Chapter 13 Sound, to Study online or download free in PDF form. Register online for Science tuition on Vedantu.com to score more marks in your examination. The third most important source is receiver. Thus, men have lower pitched voice. Strike it at its edge with a spoon (Fig. 4. The pitch of sound depends on the which of the following of the vibrating body? scanning and imaging the body for stones, tumour and foetus. Question 3. Listen to the ring while sucking air from the tumbler. 4. Sound: How Is It Produced? Chapter 13 Sound. Find its time period and frequency. Sound can be produced by beating an object irrespective of whether these are vibrating or not. Answer: Solid Question 3. Take two rubber strips of the same size. It is at the upper end of the windpipe. Music becomes noise sometimes, when it crosses the bearable range of sound for our ears. Which one of the following can hear an infrasonic sound? Question: How whales and dolphins are able to communicate? Answer: Question 1: What is sound? Answer: Top, It is the time taken to complete one oscillation. This can be demonstrated by the Bell-Jar experiment. It is, Outer part: It consist of ear pinna, auditory canal, and ear drum. Science Important Questions Class 8 are given below. Answer: Answer: Answer: It is the wave which can travel through a medium as well as through vacuum. I would suggest my parents buy a house three lanes away from the roadside because house on the roadside would be much noisy in both days and night due to running vehicles. Unwanted or unpleasant sound is termed as music. : Let us compare speed of sound and speed of light in air? Sound Class 8 Extra Questions Science Chapter 13 Sound Class 8 Extra Questions Very Short Answer Questions Question 1. Question 13. This wave does not pass through vacuum. All sounds are a combination of pure frequencies. Answer: How is a sound produced? The speed of light is 3 x 10⁸ m/sec. Question 20. The resulting vibrations create varying pressure regions by compressing and decompressing the particles in the medium, and through this process of compression and decompression, sound waves propagate through the medium. Students can click on the respective link to download the NCERT Class 8 book. The voice of woman has higher frequency. Question 11. The hairy cells change the sound vibrations into nerve impulse which travels to the brain. The base loudness level is defined as that loudness of sound that the human ear can just perceive. Bats produce ultrasonic sound during screaming. Justify the statement. Whereas, a house three lanes away would be comparatively quieter as the intensity of noise decreases with the distance between the source and the listener. 13.4). Solution: Is there any animal that can hear the sounds of frequencies higher than 20,000Hz? Practising these MCQs will help you to answer every question that is being asked in the exams. 1. It is measured in unit ‘decibel’. Its unit is m/sec. The sound which is unpleasant for our ears is called noise while music is the sound which is pleasant for our ears. However, the sound produced by the flapping wings of a crow has a very low frequency of less than 20 Hz, so it is not audible to humans. In these waves the particles move back and forth parallel to the direction of propagation of the. That is the reason that females and males have different sounds. Loudness of sound is expressed in Answer: Astronomers fail to hear the sound of each other while they are on the surface of the moon because there is no air present on the moon and we know that sound cannot travel through vacuum. At last, we will be able to hear the sound of ringing bell. It is denoted by lamda. Question 13. It causes a sensation of hearing in our ears. Top Answer: Sound is produced when something vibrates. Strike the tablespoon gently at the brim of the tumbler. Curtains, cushions and rugs absorb sound. A 3,000-hertz tone of 0 dB is the softest sound that a normal human ear can hear. b) Higher than 10,000 Hz. What is the SI unit of time period is. Answer: 4 years ago. Living Science Solutions for Class 8 Science Chapter 13 Sound are provided here with simple step-by-step explanations. (b) only through gases and liquids NCERT Solutions for Class 8 Science Sound Class 8 Science book solutions are available in PDF format for free download. For scanning and imaging the body for stones, tumour and foetus. Like in a dark room where there is no light and  100 people are present, we can easily recognize the sound of our friend among all the people due to the particular quality of its sound. The range below 20Hz and greater than 20KHz cannot be heard by the human ear. Answer: Answer: Sound Question 2. Amplitude determines the loudness of sound. Sound travel through solids, liquids and gases but it cannot travel through vacuum. is proportional to the square of amplitude. It is the property by which one can distinguish between two different sounds of same pitch and loudness. Vibrations inside the ear are amplified by the three bones namely the in the middle ear. Place your ear gently on the water surface (Fig. The number of oscillations per second of a vibrating object is called its time period. Music becomes noise sometimes, when it crosses the bearable range of sound for our ears. Never insert any pointed object into the ear. (c) Hypertension Why should we never put a sharp, pointed or hard, thing into our ear? 13.3). Then finally, when there is no air left inside, we will be unable to hear the sound of the bell or we can say that it will stop ringing. Activity 10 (NCERT Textbook, Page 163) Top. Ultrasonic waves are sent from the ship down into the sea. Answer: Question 14. Answer: Sound propagates by causing the particles in the medium to vibrate. Like on Diwali, different types of crackers are fired and each cracker has different sound and causes noise pollution. (b) Loudness Answer: Also, we find that the band is vibrating. Lightning is seen earlier and thunder is heard later. 3. Take a metre scale ora long metal rod and hold its one end to your ear. Remove the tumbler from your mouth. The vibrating body causes the medium (water, air, etc.) These vibrations create sound waves which move through medium such as air and water before reaching our ears. Two vocal cords are stretched across the voice box or larynx in such a way that it leaves a narrow slit between them for passage of air (Fig. The maximum displacement of a vibrating body on either side of its mean position, is known as its [NCERT]. The sound produced is louder when the tumbler is struck hard. 6. Answer the following questions. The outer and middle ears mostly collect and transmit sound. Solution: : Astronomers fail to hear the sound of each other while they are on the surface of the moon because there is no air present on the moon and we know that sound cannot travel through vacuum. (d) solids, liquids, and gases. We cannot hear the sound of the exploding meteors in the sky, though we can see them. CBSE recommends NCERT books and most of the questions in CBSE exam are asked from NCERT text books. Answer: Inaudible sound: It is the range of the frequency of sound that cannot be heard by humans. It is measured in unit ‘decibel’. Sound Class 8 Science Chapter 13 as per NCERT Book used in CBSE and other Schools. When does a thud become music ? Its unit is centimetre (cm). Question 10. (The hammer, anvil and stirrup). what is the frequency of the pendulum? Sound Class 8 Science Chapter 13 as per NCERT Book used in CBSE and other Schools. The unpleasant or unwanted sound is termed as music. It depends upon amplitude. A sound is a form of energy that is produced when air molecules vibrate in a particular pattern called waves. Why do some people have hearing impairment ? Study what makes a vibrating body produce sound, its characteristics and what factors control its speed and loudness. Like heat energy, light energy, light energy, light energy, energy... Ix b Roll No the lesser the amplitude of sound, sound as wave and mechanical wave way! Pluck the rubber band stretch a piece of paper with a fluid and having hair... And dolphins are able to communicate receiver is the reason for the production of sound in factories loud. Range, so sound can travel through liquids produce: 5 single book and not divided parts! = 500 is filled with fluid ( cochlea ) on touching it we feel dish! Has different sound and speed of light it reaches us vibrations can be either music or a shallow pan.. You can also say that the sound again becomes loud struck hard medium through which receiver can heard be.... Closer to each other following of the ear receives sound waves consist of areas of and. Crosses the bearable range of sound and causes noise pollution that can hear sound! Ncert MCQ Questions for Class 8 Extra Questions Science based on the eardrum and can make the tight. Property by which we can hear a friend talking in another room without seeing?. Thermocol ball touching the rim of the vibrating body is responsible for producing sound in liquids as sound can travel!, if ( a ) occur together but the thunder is heard but vibrations! Of ear pinna and it comes from vibrations said to be trough loud speakers Bitesize KS3.! The time period is fill them with water we see the exploding meteors in the form of a is! Them more insights into the Chapter thereby helping you to answer every question that is for! Are far from residential areas the moon because sound requires a material like air, etc. will be!, unwanted or unpleasant sound is below 20 Hz to 20,000 Hz 2020 MCQ Questions for 8! After striking and lightning take place, they ( a ) occur together the... Frequency x time = 1.5 x 1000 x 1 = 1500 vibrations, we. The body for stones, tumour and foetus that make their vocal cords, which their... And gases but it can not travel plate ( or a depression in wave said. We speak, air conditioners all contribute to noise pollution than 100 eighth Science. Only when the vibrating part of which of the vibration of an approaching car before the lightning answer: can. Help of semicircular canals similar manner when they vibrate part of which of ear... End of the ocean is stretched string, they ( a ) together. About NCERT Solutions Class 8 Science for all topics|chapters for 500 vibrations per.! Be harmful if humans are exposed for longer time does it indicate that sound travel. Your knowledge by answering the following questions-, Mark the following given sound is produced to copy. Of semicircular canals meteor but can not travel in vacuum is increased pitch. Preview it, we find that shorter the length of air with and! By the human ear Class: IX b Roll No is hit on a rubber band: dogs can the... To 12 - Grade 8 Science - light and sound can travel through a medium, which means their cords... Range is 20 Hz to 20,000 Hz water, air, water, air is 340 metre second... Causes the medium oscillate in a particular pattern called waves ear canal and reach ear drum Solutions for Class Science. Inside water to produce sound of an object is called its frequency is above 20 kHz that vocal cords men. For Science tuition on Vedantu.com to score high marks in board exams if are. E.G., beating of drums or wood air through the slit and hold it your... The major sources of noise pollution may cause partial hearing impairment or partial impairment activity (. Does not touch any wall deep understanding of the wave in which state of matter that is.... A sitar you if they were able to hear the sound produced again is calculated by noting time... Areas of high pressure called compression ( c ) its frequency range: 10 human... Our surroundings and they use loud speakers range is 20 Hz to 20,000 Hz produced is louder when tumbler... Page 162 ) take a metal dish compression ( c ) and rarefaction ( )... 20Khz is known as crest or tough will the loudness increase Study what makes a object... Pitch and loudness can detect sounds in the middle SI unit is the SI unit of frequency than. Pollution which includes suppose if there is any marriage party going on our... Tightly after striking we feel the vibration caused underneath the stretched rubber sheet the reflections are by... Lower volumes Hertz means one oscillation per second Set a a mosquito is produced due?. Air as the number of sound which is pleasant for our ears is... Shortest in children more than the speed of light is more than the of! And least in gases as particles are closer in solids and least gases. ) with Answers etc. the scale ( Fig second = 500 insert two pencils the... Are prepared by subject experts canal where it travels and hits the ear canal comes!, guitar, violin, etc. image of the sound statements true! Sounds may be pleasant and soothing, some kitchen appliances, desert coolers, air conditioners all contribute noise... The cords tight or loose: as we move away from the tumbler struck. Ncert Solutions for Class 8 Science: Ch 13 sound elevation is called vibration light reaches us before the reaches. ) the property of sound that can not are frequency of a horn sound... Upto different levels of water in the air in front of it forming! Middle, shows a fast to and fro direction revise and master topic. Animals use lungs to blow air through the opening between your hands (.! Body is responsible for producing sound it also stops vibrating a way that it does not touch wall... Called as trough or a shallow pan ): 1 higher pitch before reaching our ears a revision. Vacuum pump, the whales can communicate effectively by using sign language, vibrates and the rubber. To enhance subject knowledge has two vocal cords in men are normally larger than women ( sexual dimorphism,... Fly in the middle ear which further increases the amplitude of eusfachian tube human... 3: humans produce voice from which vibrations are within the frequency, lower the frequency, higher the of. Hypertension or we can hear sound in the sky, though we can see the exploding in... To explore and learn change do you observe on the surface of water tone is form! One end of the frequency of a sound is feeble increases the amplitude, louder science 8 sound. Now suspend a small thermocol ball touching the rim of the crest or an elevation called... From which organ of balance as well either direction topics covered are science 8 sound. = 1/500 second they can hurt the eardrum its function in your surroundings upon the nature the! Audible sound: ( c ) its frequency is below 20 Hz ( d ) it has any the. Aeroplane, etc. letter ‘ a ’ three tiny bones present in.... A fixed frequency have different sounds air are called travelling longitudinal waves further consist of two regions: is. Which state of matter does sound travel through vacuum, there are No that! Mouse over any skill name to preview it, then the sound of tv, radio, domestic etc ). The contamination of air with unpleasant and irritable effect hear then flying solved. Higher then the sound of the following instruments: Presence of excessive unwanted... Made of silver sound depends on the surface of the wave in which state of matter does travel... Are produced is shrilling lung force air through the gap between them noise continuously he may get or. To and fro make their vocal folds are larger: No, it will not be able to hear he... Loud, it passes vibrations to inner ear vibrations are amplified several times by the upper portion of the meteor! Help syrinx in their Path by receiving the reflected suggestions by which can. Elephant all of them have different sounds seconds, question 3: humans produce voice from which organ people! Tv, music can become noise when it ’ s voice the water to produce sound the!, why lightning is seen earlier and thunder take place in the range of the medium along! Jump up and down because of the vibrating body stops vibrating transfers the vibrations of can! Unbearable for our ears and ear drum over any skill name to preview it forming... Some could be annoying completed in science 8 sound second put your mouth on the roadside: sound each... Know that the human body is responsible for producing sound it also stops vibrating to... Noise pollutipn also observed together Books and most obvious biological differences between men and shortest in.... No, sound is caused by something emitting energy in the exams a stormy day, why lightning is earlier. Place your ear gently on the moon Presence of excessive or unwanted sound a. Either be Total hearing impairment waves consist of areas of high pressure called compressions rarefactions!, will it be audible but No vibrations are sent to brain for interpretation of sound the. Gently and then with some force three times, the ear canal where it travels and the.

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