Biology, 29.08.2019 23:20, martintrhernandez

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?
(speed = distance
time
0 25 seconds
0.50 seconds
2.0 seconds
4. biseconds
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1: 33 pm
8/29/2019
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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...