Question #488e5

1 Answer
Sep 3, 2016

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.