Doppler Effect Formula
The Doppler Effect, when associated with sound, is the change in frequency of a source as it moves.
The frequency will appear to increase as the source comes towards a listener and will appear to decrease as the source moves away from a listener.
f = fs (v + vL)/(v - vs) for sound
f = frequency heard by listener in Hz
fs = frequency of the source in Hz
v = velocity of sound in m/s
vs = velocity of the source in m/s
(positive if moving towards listener, negative if moving away from listener)
vL = velocity of listener in m/s
(positive if moving toward the source, negative if moving away from the source)
For calculation we consider following values
f = a, fs= b, v = v, vs = x vL= y
hence we rewrite formula as
a = b(v+y)/(v-x)
