Physics, 17.02.2022 14:00 rose3358

A boy yells in a narrow valley. The sound reflects off of a boulder that is 80 m away. How long will it take to hear the echo if the speed of a sound wave is 320 m/s? (speed = ) 0. 25 seconds 0. 50 seconds 2. 0 seconds 4. 0 seconds.

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A boy yells in a narrow valley. The sound reflects off of a boulder that is 80 m away. How long will...

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