Posted by **Diana** on Tuesday, April 9, 2013 at 6:05pm.

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)

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