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## Homework Statement

A physics student drops a vibrating 421 Hz tuning fork down the elevator shaft of a tall building. The temperature in the shaft is 20 °C. When the student hears a frequency of 392 Hz, how far has the tuning fork fallen?

f

_{S}= 421 Hz

f

_{L}= 392 Hz

V

_{SOUND}= 343 m/s

## Homework Equations

Doppler Equation: f

_{L}= f

_{s}(V

_{SOUND}+ V

_{listener})/(V

_{SOUND}+ V

_{Source})

## The Attempt at a Solution

I solved for the velocity of the source and got 25.38 m/s but I don't really get how I would apply it to this problem. If only I had time.