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

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 = \\frac{distance}{time}) 0.25 seconds 0.50 seconds 2.0 seconds 4.0 seconds

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 = \\frac{distance}{time}) 0.25 seconds 0.50 seconds 2.0 seconds 4.0 seconds

Answer

Explanation:

Step1: Determine total distance

The sound travels to the boulder and back, so $d = 2\times80= 160$ m.

Step2: Use speed - time - distance formula

We know $v=\frac{d}{t}$, so $t=\frac{d}{v}$. Substituting $d = 160$ m and $v = 320$ m/s, we get $t=\frac{160}{320}$.

Step3: Calculate time

$t=\frac{160}{320}=0.5$ s.

Answer:

0.50 seconds