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.

Question

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The Answer of 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.

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