Question

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?

Answer 1

0.50 s

Step-by-step explanation:

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Answer 2

`Given:\\v=320 (m)/(s)\\s=2\cdot 80m=160m\\\\Find:\\t=?\\\\Solution:\\\\v= (s)/(t) \;\;\;/\cdot t\\\\vt=s\;\;\;/v\\\\t= (s)/(v) \\\\t= (160m)/(320 (m)/(s)) =0.5s`