- #1

Patrikp

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## Homework Statement

At the initial moment source and detector are located in same point and are both in rest. Source is released into free fall and detector remains in rest. Source has frequency f

_{s}=512 Hz and speed of sound is v=340 m/s . When detector detects frquency f =485 Hz , what distance has the source travelled?

## Homework Equations

$$f=f_s \left( \frac{v_s}{v_s+v} \right)$$

## The Attempt at a Solution

My book uses the formula I gave above, for which I know it´s true when there is no acceleration. I tried to get to formula myself but i aways get that time between registered waves at the detector is increasing so frequency should be decreasing? If it should then again I do not know how to go about calculating that kind of frequency.

Thanks and sorry for bad english

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