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Physics, 28.09.2019 17:20 vkffgj

Aboy 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?

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Aboy yells in a narrow valley. the sound reflects off of a boulder that is 80 m away. how long will...
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