Two sources of sound placed close to each other, are emitting progressive waves given by $ y_1=4sin\left( {600\pi t} \right)$ and $y_2=5sin\left( {608\pi t} \right)$ An observer located near these two sources of sound will hear
  • 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 waning.
AIPMT 2012, Medium
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