Question

Question #488e5

Answer 1

We know that speed of sound in air is `343.6` metres per second at a temperature of `20^@"C"`
Also that `"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]()

If `d` us depth of the death valley, we can setup the equation as below
`343.6=(2d)/8.9`

`=>d=343.6xx8.9/2`
`=>d=1529.0m`, rounded to one decimal place.