First slide

Travelling wave

Question

The minimum distance of reflector surface from the source for listening the echo of sound is (speed of sound = 332 m/s)

Moderate

A

28 m
B

18 m
C

19 m
D

16.5 m

Solution

$2 d = v \times t$ , where v = velocity of sound = 332 m/s
t = Persistence of hearing = $\frac{1}{10} \sec$ .
$\Rightarrow d = \frac{v \times t}{2} = \frac{332 \times \frac{1}{10}}{2} = 16 .5 m$

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