Two sources of sound placed close to each other, are emitting progressive waves given by y_1 = 4 600 t and y_2 = 5 608 t. An observer located near these two sources of sound will hear:

NEET 2012 Physics question

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:

(1)4 beats per second with intensity ratio 81 : 1 between waxing and waningCorrect
(2)4 beats per second with intensity ratio 25 : 16 between waxing and waning
(3)8 beats per second with intensity ratio 25 : 16 between waxing and waning
(4)8 beats per second with intensity ratio 81 : 1 between waxing and waning

Answer: (1)

Solution

Compare with : and . The beat frequency is beats per second. The resultant amplitude varies between (waxing) and (waning). Intensity is

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Question ID VK-091266