Nature of Sound
Nature of Sound
Nature of sound : Sound is a mechanical and longitudinal wave. It needs material medium to propagate. It is produced by small and large pressure changes.
Speed of sound: Sound waves travel at different speeds in different substances. The speed of sound depends on various factors like temperature, nature and physical state of the substance, etc. for example, the speed of sound in air is about 3.30m/s at C and 346 m/s at room temperature. Also notice from table that sound waves travel fastest in solids and slowest in gases.
Substance | Speed (m/s) | Substance | Speed (m/s) |
Air | 346 | Aluminum | 5000 |
Water | 1498 | Iron | 5000 |
Mercury | 1452 | Diamond | 12,000 |
Glass | 5000 |
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Light, propagates faster than sound . All of us have, at one time or the other, been shaken and frightened by the roaring thunder sounds that follow flashes of lightning. The thundering sounds are always heard a little after seeing the flash of lightning. Why?
In early stages, people thought that we hear the thunder a little after seeing the lightning simply because the thunder perhaps occurred a little later. We now know that this is not the reason. Both lighting and thunder really occur together. The reason for the delay, in hearing the thunder, is due to the difference in the speeds of sound and light.
Measurement of the speed of light and sound tell us that light propagates very fast as compared to sound. The speed of sound in air is nearly 30 m/s (or 0.33 km per second) whereas speed of light is as high as 3 lakh kilometers per second. Light, thus, propagates nearly a million times faster than the sound. Hence, when lighting and thunder occur together, the flash of lighting (i.e. light) reaches us in practically zero time. The sound of the thunder however, takes a few seconds to reach us.
Velocity of sound in air:
CHOOSE THE CORRECT ANSWER: | |||
| Right Option : D | |||
| View Explanation | |||
A person, pressing his ear on the railway tracks can hear an approaching train.This is possible due to: | |||
| Right Option : C | |||
| View Explanation | |||
Sound tavels faster in ______ than in liquids. | |||
| Right Option : A | |||
| View Explanation | |||
Students / Parents Reviews [20]
I have spent a wonderful time in Abhyas academy. It has made my reasoning more apt, English more stronger and Maths an interesting subject for me. It has given me a habbit of self studying
Yatharthi Sharma
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Barkha Arora
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Shreya Shrivastava
8thAbhyas institute is one of the best coaching institute in the vicinity of Ambala Cantt area. The teachers of the institute are well experienced and very helpful in solving the problems of the students.The good thing of the institute is that it is providing extra classes for the students who are w...
Aman Kumar Shrivastava
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8thIn terms of methodology I want to say that institute provides expert guidence and results oriented monitering supplements by requsite study material along with regular tests which help the students to improve their education skills.The techniques of providing education helps the students to asses...
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Aman Kumar Shrivastava
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Shreya Shrivastava
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Aman Kumar Shrivastava
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Om Umang
10thUsually we see institutes offering objective based learning which usually causes a lag behind in subjective examinations which is the pattern followed by schools. I think it is really a work of planning to make us students grab the advantages of modes of examination, Objective Subjective and Onli...
