# PHYSICS - Waves

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Can someone tell me how to get the answer to this question? Just a formula would be great. It's on my physics study guide for my unit test.

It takes 2.30 s for an echo to come back from a sound wave sent to the bottom of a 25 degree C lake. How deep is the lake at this location? (Answer, 3433.9 m)

• PHYSICS - Waves -

D = = V*t = 343m/s * (2.3/2) = 394.5 m.

NOTE: If your answer is correct, the lake is 0ver 2 miles deep.

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