Question 61

The echo of the sound of a boy standing in front of a mountain is heard after 0.2 s. What is the distance of the mountain from the boy when speed of the sound is 342 m/s?

Solution

echo of the sound = 2 times of the original sound

0.2sec = 2x

x = 0.1 sec

speed = $$\frac{distance}{speed}$$

    0.1 = $$\frac{distance}{342}$$

distance = 34.2 m


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