Question

# A pendulum has a frequency of 5 vibrations per second. An observer starts the pendulum and fires a gun simultaneously. He hears the echo from a cliff after 8 vibrations of the pendulum.  If the velocity of the sound in air is 340 m/s, what is the distance between the cliff and the observer? 544 m700 m170 m272 m

Solution

## The correct option is D 272 m

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