Doppler Effect (Receding)

f^{'} = 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.

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