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Why cannot we hear an echo in a small ro...

Why cannot we hear an echo in a small room ?

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To hear an echo the minimum distance between the source and the reflecting surface should be nearly 17 cm but the length of the room is less than 17 cm, therefore, we cannot hear an echo.
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MODERN PUBLICATION-WAVES-REVISION EXERCISES
  1. What is the difference between a tone and a note?

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  2. Is Doppler effect applicable only to sound waves.

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  3. Why cannot we hear an echo in a small room ?

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  4. What determines the quality of sound ?

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  5. What is meant by fidelity of instrument ?

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  6. On which factor the pitch of the sound depends ?

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  7. Where will a person hear maximum sound, at node or antinode?

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  8. DOPPLER EFFECT

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  9. In a stationary longitudinal wave, nodes are points of

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  10. Doppler effect is applicable for

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  11. According to Newton, when a wave passes through a gas, changes taking ...

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  12. Where should a stretched wire, held between two fixed supports, be plu...

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  13. When a wave coming from a medium where its velocity is………………meets a me...

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  14. During the formation of a stationary wave, the medium is broken into l...

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  15. The second overtone can also be called as ………………………harmonic.

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  16. …………………is a musical instrument in which sound is produced by setting a...

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  17. In an……………………Organ pipe, both odd and even harmonics are present.

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  18. If the prong of a tuning fork is filed, its frequency………………and if it l...

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  19. Pitch of the sound appears to…………………………when the source of sound moves ...

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  20. When the observer is at rest and the source moves with a supersonic sp...

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