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Question
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.
Numerical
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Solution
Distance between building and person (d) = 132.8 m
Time of echo (t) = 0.8 s
\[ \text{Speed of sound } (v) = \frac{2d}{t} \]
\[ = \frac{2 \times 132.8}{0.8} \]
= 332 ms−1
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