A soldier walks towards a high wall walking 120 steps per minute. When he is at a distance of 90 m from the
wall he observes that echo of step coincides with next step. The speed of sound must be
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Explanation:
Total no. of steps in one second = 120/60 = 2
Total distance travelled by the sound wave in round trip = 85×2 cm = 170 cm
when echo previous step is coincide with the next step then time interval is 1/2 = 0.5 s
( because 2 steps are covered in 1 second so one step will be covered in 1/2 s)
Speed of the sound = distance travelled / time taken = 170/0.5 = 340 cm/s
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