MHT CET Physics question

Physics Waves MHT CET

Two sources of sound placed close to each other, are emitting progressive waves given by and . An observer located near these two sources of sound will hear [CBSE PMT (Prelims) 2012]

(A)4 beats per second with intensity ratio 25 : 16 between waxing and waning
(B)8 beats per second with intensity ratio 25 : 16 between waxing and waning
(C)8 beats per second with intensity ratio 81 : 1 between waxing and waning
(D)4 beats per second with intensity ratio 81 : 1 between waxing and waningCorrect

Answer: (D)

Solution

Beat frequency per second, and $ = = 81 :

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Question ID VK-070146