Question #488e5

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Question #488e5

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Answer 1 · 2016-09-03T12:03:27

We know that speed of sound in air is $343.6$ $343.6$ metres per second at a temperature of $20^{\circ} C$ $20^@"C"$
Also that $Speed = \frac{Distance Traveled}{Time}$ $"Speed"="Distance Traveled"/"Time"$

When you yell down the death valley and hear your echo coming back, the sound travels down and up the valley.
it is similar to shouting down a well as shown in the figure below

![hswstatic.com]( useruploads.socratic.org )

If $d$ $d$ us depth of the death valley, we can setup the equation as below
$343.6 = \frac{2 d}{8.9}$ $343.6=(2d)/8.9$

$\Rightarrow d = 343.6 \times \frac{8.9}{2}$ $=>d=343.6xx8.9/2$
$\Rightarrow d = 1529.0 m$ $=>d=1529.0m$ , rounded to one decimal place.

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Question #488e5

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