The echo of a gun shot is heard 8 sec. after the gun is fired. How far from him is the surface that reflects the sound (velocity of sound in air = 350 m/s)

1400 m

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2800 m

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700 m

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350 m

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Solution

The correct option is A 1400 m

Suppose the distance between shooter and reflecting surface is d. Hence time interval for hearing echo is

$t = \frac{2 d}{v} \Rightarrow 8 = \frac{2 d}{350} \Rightarrow$ d=1400 m.

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Similar questions

Q. If you hear a gun shot 2 sec after it is fired, how far away from the gun are you? (speed of sound in air =

{330 m s}^{- 1}

(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 $20^{o}$ C)?

(c) A man standing 825 metres away from a cliff (steep rock) fires a gun. After how long will he hear its echo? The speed of sound in air is $330 m / s$ .

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The echo of a gun shot is heard 8 sec. after the gun is fired. How far from him is the surface that reflects the sound (velocity of sound in air = 350 m/s)

The correct option is A 1400 m Suppose the distance between shooter and reflecting surface is d. Hence time interval for hearing echo is t=2dv ⇒ 8=2d350⇒ d=1400 m.

The correct option is A 1400 m

Suppose the distance between shooter and reflecting surface is d. Hence time interval for hearing echo is

$t = \frac{2 d}{v} \Rightarrow 8 = \frac{2 d}{350} \Rightarrow$ d=1400 m.