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A bat flying in a cave emits a sound pulse and receives its echo in 4 s. How far away is the cave wall?

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A bat flying in a cave emits a sound pulse and receives its echo in 4 s. How far away is the cave wall?

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  1. Sound travels at about 330 m/s, so the pulse travels a total of 330 * 4 = 1320m.

    However, it has to travel from the bat to the wall, then back again, so the distance from bat to wall is half the above, or 660m.

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