# A pendulum has a frequency of 4 vibrations per second. An oberver starts the pendulum and fires a gun simultaneously. He hears the echo from the cliff after 6 vibrations of the pendulum - Physics

Numerical

A pendulum has a frequency of 4 vibrations per second. An oberver starts the pendulum and fires a gun simultaneously. He hears the echo from the cliff after 6 vibrations of the pendulum, if the velocity of sound in air is 340 m/s, find the distance betwen the cliff and the obsever.

#### Solution

v =4H                 vs = 340 m/s

T =1/4 sec

t = 6 xx1/4 = 1.5 sec

As echo is listened ;

2d = v_s xx t

d =(v_s xx t)/2 = (340 xx 1.5 )/2 = 255m

Concept: Sound (Numerical)
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