Two vibrating tuning forks produce progressive waves given by Y1=4sin500πt and Y2=2sin506πt. Number of beats produced per minute is 

(1) 360

(2) 180

(3) 3

(4) 60

(2) From the given equations of progressive waves ω1=500π and ω2=506π

n1=250 and n2=253

So beat frequency =n2n1=253250=3 beats per sec

∴ Number of beats per min = 180.

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