# Physic

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If you shout across a canyon and hear the echo 0.57 s later, how wide is the canyon?

• Physic -

2*Width = (sound speed)*(0.57 s)

The sound speed depends upon temperature but is about 340 m/s
Solve for the width. I hope you see why the factor 2 is needed.

• Physic -

96.9

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