Waves:-
Source (S)# | Listener (L) (X) | Nature of velocities | Expression for f ' |
# ![]() | ![]() | +ve, +ve | f ' = (V-b/V-a) f |
# ![]() | ![]() | +ve, -ve | f ' = (V+b/V-a) f |
![]() | ![]() | -ve, -ve | f ' = (V+b/V+a) f |
![]() | ![]() | -ve, +ve | f ' = (V-b/V+a) f |
(d) Effect of motion of medium:-
Apparent frequency:-f ' = [(R-b)/(R-a)] f
Here, R = V+ωcosθ, ω is the velocity of wind, θ is the angle between direction of propagation of sound and that of wind.
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