1.

A source of sound emits waves with frequency f  Hz and speed V m/sec. Two observers move away from this source in opposite directions each with a speed 0.2 V relative to the source. The ratio of frequencies heard by the two observers will be                                                        [MP PET 1990]

A.            3 : 2                                          
B.            2 : 3
C.            1 : 1                                          
D.            4 : 10
Answer» D.            4 : 10


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