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Q.

Observer  O1 and O2  are at rest and wall is moving with speed  VW. Speed of car is VS  and emits frequency  f0. Speed of sound with respect to ground is  V. Then match the List-I with List-II.

Question Image
List – IList – II
P)Wavelength received by  O1 directly from cart1)V+VSf0
Q)Wavelength received by O2  directly from cart2)VVSf0
R)Wavelength received by driver of the cart after reflection from wall3)(V+VWVVW)(VVSf0)
S)Wavelength received by O2  after reflection from wall4)(V+VWVVW)(V+VSf0)

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a

P(1),Q(2),R(4),S(3)

b

P(2),Q(1),R(3),S(4)

c

P(2),Q(1),R(3),S(3)

d

P(1),Q(2),R(3),S(4)

answer is C.

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Detailed Solution

Refer Doppler effect theory

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