Question

Explain how the speed of sound can be determined by the method of echo

Answer 1

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Speed =Distance travelled / Time taken

Echo is a reflected sound.

To hear an echo, sound has to travel a distance from the source to the reflector and then back to the source. 

So, if distance between source and reflector is x, then total distance travelled by sound will be 2x. And suppose time taken is 't'

Speed of sound=Total distance travelled / Time taken

=2 x / t

Answer 2

Zooming in and using the cursor to precisely determine the time of popping and echo return yields a round trip travel time of 0.26586 seconds for the sound wave to travel a round trip distance of 91.44 m. The speed of sound is then 343.94 m/s.