An echo is heard after $0.8 s$ , when a person fires a cracker, $132.8 m$ from a high building. Calculate the speed of sound.

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Solution

Find the speed of the sound
Given data:
Time for echo, $t = 0.8 s e c$
Height of building, $d = 132.8 m$
Now,
$D i s \tan c e t r a v e l e d b y s o u n d = 2 \times h e i g h t$
Distance traveled $= 2 \times 132.8$
$= 265.6 m$
Then,
$S p e e d = \frac{D i s \tan c e}{T i m e}$
Substitute the values
$= \frac{265.6}{0.8}$
$= 332 m s^{- 1}$
The speed of the sound is $332 m s^{- 1}$

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An echo is heard after 0.8s, when a person fires a cracker, 132.8m from a high building. Calculate the speed of sound.

Find the speed of the soundGiven data:Time for echo, t=0.8secHeight of building,d=132.8mNow, Distancetraveledbysound=2×heightDistance traveled =2×132.8 =265.6m Then, Speed=DistanceTimeSubstitute the values =265.60.8 =332ms-1The speed of the sound is 332ms-1

An echo is heard after $0.8 s$ , when a person fires a cracker, $132.8 m$ from a high building. Calculate the speed of sound.