Doppler Effect Receding Source Calculator

I want to calculate
Wave Velocity(v) = m/s
Wavelength Behind Source(λb) = m
New Frequency of Receding Source(f') = Hz
 

The Doppler effect/shift is the change in frequency of a wave moving relative to its source. the received frequency is higher during the approach.

Doppler Effect Receding Source:

New Frequency of Receding Source:
f'= v/λb

where λb = Wavelength Behind Source, v = Wave Velocity, f' = New Frequency of Receding Source.

For example, when Wave Velocity(v) = 12 m/s, Wavelength Behind Source(λb) = 3 m, then New Frequency of Receding Source(f') = 4 Hz.

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