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प्रश्न
A man standing 25 m away from a wall produces a sound and receives a reflected sound. It the speed of sound is 350 ms−1, after what time he hears sound?
संख्यात्मक
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उत्तर
d = 25
t = ?
v = `(2d)/t`
t = `(2d)/v`
= `(2 xx 25)/350`
= `1/7` sec
= 0.1428
Therefore, he hears the reflected sound after approximately 0.143 s.
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