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Waves
Waves

Doppler Effect (Receding)

f′=fv−vov+vsf' = f\frac{v - v_o}{v + v_s}

Frequency decreases when source and observer recede.

Variables

f'
Observed frequency
Lower frequency
Hz
f
Source frequency
Emitted frequency
Hz
v
Wave speed
Speed in medium
m/s
v_o
Observer velocity
Away from source
m/s
v_s
Source velocity
Away from observer
m/s

Derivation

Special case of general Doppler formula.

Your notes

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Common questions

What is the Doppler Effect (Receding) formula?

Doppler Effect (Receding) is written f' = fv - vₒ/v + vₛ. Frequency decreases when source and observer recede. It belongs to Waves, under Doppler Effect.

What are the units in f' = fv - vₒ/v + vₛ?

In SI units, f' is observed frequency, measured in 1/s; f is source frequency, measured in 1/s; v is wave speed, measured in m/s; v_o is observer velocity, measured in m/s; v_s is source velocity, measured in m/s.

How is the Doppler Effect (Receding) formula derived?

Special case of general Doppler formula. The result is f' = fv - vₒ/v + vₛ.