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You Shout at a Cliff,and Hear Your Echo in 2

Question 25

Multiple Choice

You shout at a cliff,and hear your echo in 2 seconds.If the speed of sound in the air is 340 m/s,the distance of the cliff from you is

A) 85 m.
B) 170 m.
C) 340 m.
D) 680 m.
E) none of the above.

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