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What is sound and how is it produced ?...

What is sound and how is it produced ?

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Sound is a form of eneergy which gives the sensation of hearing. It is produced by the vibrations caused in air by vibrating objects.
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NCERT-SOUND -Exercise
  1. What is the range of frequencies associated with (a) infra sound (...

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  2. A submarine emits a sonar pulse, which returns from an underwater clif...

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  3. What is sound and how is it produced ?

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

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

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  6. Why is sound wave called a longitudinal wave ?

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

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

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

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

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

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

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

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

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

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

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

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

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

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  20. How is ultrasound used for cleaning ?

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