Physics, 13.08.2021 04:20, liyahheadhigh

how long will it take an echo to return across a valley that is 73.0 m from one side to the other?( Temperature is 25 degrees celsius. Remember to calculate the total distance the sound must travel.)

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how long will it take an echo to return across a valley that is 73.0 m from one side to the other?(...