A small source of sound moves on a circle as shown in figure and an observer is sitting at O. Let ν1,ν2,ν3 be the frequencies heard when the source is at A, B and C respectively
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a
ν1> ν2> ν3
b
ν1= ν2= ν3
c
ν2> ν3> ν1
d
ν1> ν3> ν2
answer is C.
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Detailed Solution
According to Doppler’s effect. when it approaches frequency will be maximum and going away will be minimum and it will be same when it moves perpendicular.