1.

Two vibrating tuning forks produce progressive waves given by \[{{Y}_{1}}=4\sin 500\pi t\]and \[{{Y}_{2}}=2\sin 506\pi t.\] Number of beats produced per minute is         [CBSE PMT 2005]

A.            360
B.            180
C.            3    
D.            60
Answer» C.            3    


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