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Cite an experiment to show that sound ne...

Cite an experiment to show that sound needs a material for its propagation.

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Take an electric bell and an air tight glass bell jar connected to a vacuum pump. Suspend the bell inside the jar, and press the switch of the bell. You will be able to hear the bell ring. Now pump out the air from the glass jar. The sound of the bell will become fainter and after some time, the sound will not be heard. This is so because almost all air has been pumped out.This shows that sound needs a material medium to travel.
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Following are down the steps of an experiment to prove that medium is required for the propagation of sound waves. Arrange these steps in propagation of sound waves. Arrange these steps in proper sequence (a) Consider a glass jar with an outlet connected to a vacuum pump and a closed lid (b) Suspend an electric bell. (c) Evacuate the jar by using a vaccum pump (d) Switch on the electric bell (e) Observe that the intensity of the sound is less when the jar is evacuated (f) This proves that medium is required for the propagation of sound

Sound Needs A Medium

STATEMENT-1 : Velocity of light depends on electric and magnetic properties of medium, STATEMENT-2 : Electromagnetic wve does not need any material medium for its propagation.

NCERT-SOUND -Exercise
  1. What is sound and how is it produced ?

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  2. Describe with the help of a diagram, how compressions and rarefactions...

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  3. Cite an experiment to show that sound needs a material for its propaga...

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  4. Why is sound wave called a longitudinal wave ?

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  5. Which characteristic of the sound helps you to identify your friend by...

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  6. Flash and thunder are produced simultaneously. But thunder is heard a ...

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  7. A person has a hearing range from 20 Hz to 20 kHz. What are the typica...

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  8. Two children are at opposite ends of an aluminium rod. One strikes the...

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  9. The frequency of a source of sound is 100 Hz. How many times does it v...

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  10. Does sound follow the same laws of reflection as light does ? Explain.

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  11. When a sound is reflected from a distant object, an echo is produced. ...

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  12. Give two practical applications of reflection of sound waves.

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  13. A stone is dropped from the top of a tower 500 m high into a pond of w...

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  14. A sound wave travels at a speed of 339 m//s. If its wavelength is 1.5 ...

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  15. What is reverberation ? How can it be reduced ?

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  16. What is loudness of sound ? What factors does it depend on ?

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  17. Explain how bats use ultrasound to catch a prey.

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  18. How is ultrasound used for cleaning ?

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  19. Explain the working and application of a sonar.

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  20. A sonar device on a submarine sends out a signal and receives an echo ...

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