# Physics

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A bat flying in a cave emits a sound and receives its echo 0.9 s later. How far away is the cave wall?

The distance there and back is given by
distance=velocitySound*time

We are not given velocity to solve for the problem.

The velocity of sound is something you ought to memorize.
vsound= 344 m/s at room temp, standard pressure.

• Physics -

516 meters

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