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1. A sound engineer has set up his mixing equipment a distance from an outdoor band shell.She claps her hands and hears the echo 0.250 s later. If the speed of sound was 340.0m/s, how far from the wall was she?

Respuesta :

Given

Hears the echo at , t=0.250 s

Speed pf sound is v=340 m/s

To find

The distance from the wall

Explanation

let her distance from the wall be d.

When she hears the echo, the sound has travelled the same distance twice

So

[tex]\begin{gathered} v=\frac{2d}{t} \\ \Rightarrow340=\frac{2d}{0.250} \\ \Rightarrow d=d=42.5\text{ m} \end{gathered}[/tex]

Conclusion

The distance of the wall from her is 42.5 m

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