ntAn echo repeats two syllables. If the velocity of sound is 330 m/s, the the distance of the reflecting surface isn

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A syllable can be uttered in 1/5 s.

It is given that an echo repeats two syllables. If the velocity of sound is 330 m/s, then the distance of the reflecting surface is:

Q. A man pronounces

a, b, c, d

and

e

and hears last four syllables as an echo. Taking velocity of sound as

340 m s^{- 1}

, the distance of reflecting surface, if it takes one-fifth of a second to pronounce or hear one syllable is

Q. (a) What is an echo ? How is echo formed ?
(b) What is the minimum distance in air required from a sound reflecting surface to hear an echo (at 20°C) ?
(c) A man standing 825 metres away from a cliff (steep rock) fires a gun. After how long will he hear its echo ? Speed of sound in air is 330 m/s.

When a sound is reflected from a distant object, an echo is produced. Let the distance between the reflecting surface and the source of sound production remains the same. Do you hear echo sound on a hotter day?

Q. At

20^{o} C

,the minimum distance of a person from a sound reflecting surface to hear an echo is.

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