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Two sound waves of equations y1 = 3 sin ...

Two sound waves of equations `y_1 = 3 sin ( 200pi - 2pix/5)` cm and `y_2 = 3 sin ( 210pit - 2pix/4.9)` cm . Number of beats per second will be

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Between the given two a.c., which one leads in phase? I_1 = 32 sin (100pit - pi//3) (I_2= 62 sin (100pit - pi//4)

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