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Two sources of sound placed close to each other, are emitting progressive waves given by

${\mathrm{y}}_{1}$=4 sin 600$\mathrm{\pi t}$ and ${\mathrm{y}}_{2}$=5 sin 608 $\mathrm{\pi t}$

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 waxing and waning

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