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Echo

A pendulum ha...

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?

A

544 m

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B

700 m

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C

170 m

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D

272 m

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Solution

The correct option is D
272 m

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