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Sunil is standing between two walls. The...

Sunil is standing between two walls. The wall closest to him is at a distance of 660 m. If he shouts, he hear the first echo after 4 s and another after another 2 seconds.
What is the distance between the two walls?

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CHETANA PUBLICATION-Study of Sound-EXERCISE
  1. Sunil is standing between two walls. The wall closest to him is at a d...

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  2. The unit of frequency is …………… .

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  3. The normal hearing range for humans is ………… .

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  4. Sound will not travel through ……….. .

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  5. SI unit of …………..is Hertz (Hz).

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  6. The velocity of sound is inversely proportional to the………… .

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  7. Sound waves with frequency greater than 20 kHz are called……….. .

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  8. The loudness of a sound depends upon ………… .

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  9. …../… are used in sonography.

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  10. The ……….receives the vibrations coming from the membrane and converts ...

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  11. Sound will not travel through ……….. .

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  12. SI unit of …………..is Hertz (Hz).

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  13. The loudness of a sound depends upon ………… .

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  14. …………are used in sonography.

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  15. Match the columns:

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  16. The intensity of reverberation is higher in a closed and empty house.

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  17. Bats can navigate in dark.

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  18. Sound travels faster in iron than in air.

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  19. The roof of a movie theatre and a conference hall is curved. Why?

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  20. The intensity of reverberation is higher in a closed and empty house.

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  21. What is an echo? What factors are important to get a distinct echo?

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