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Echo

Explain how t...

Question

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

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Solution

Speed = $fraction numerator d i s tan c e space t r a v e l l e d over denominator t i m e space t a k e n end fraction$
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 soundin $\frac{m}{s e c}$
= $fraction numerator t o t a l space d i s tan c e space t r a v e l l e d space over denominator t i m e space t a k e n end fraction$
= $fraction numerator 2 x over denominator t end fraction$

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