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?
fS = 421 Hz
fL = 392 Hz
VSOUND = 343 m/s
Doppler Equation: fL = fs(VSOUND + Vlistener)/(VSOUND + VSource)
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.