Two vehicles A and B are moving towards each other with same speed u = 25m/s. They blow horns of the same frequency f = 550 Hz. Wind is blowing at speed w = 20 m/s in the direction of motion of A. The driver of vehicle A hears the sound of horn blown by vehicle B and the sound of horn of his own vehicle after reflection from the vehicle B. If difference of wavelength of both sounds received by A is 
. Find P. Velocity of sound is = 320 m/s.
Text Solution
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(73)
→ w
A → u u → B
(I) sound of horn of B:
apparent wave length of sound received by A is a result of doppler effect due to source velocity only
so apparent frequency when only source is moving
f' = 
× f
so apparent wavelength λ' = 
λ ' = 
frequency = 
(II) Sound reflected from B:
frequency received & reflected by B,
f’ = f 
wavelength of reflected sound
λ’’ = 
= 
frequency of reflected sound
= 
= 
f
λ’ – λ’’ = 
Hence P = 73
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