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[" 66.Three sound waves of equal amplitu...

[" 66.Three sound waves of equal amplitudes "],[" have frequencies "(v-1),v,(v+1)" .They "],[" superpose to give beat.The number of beats "],[" produced per second will be "quad " [AlEEE "2009]],[[" (a) "4," (b) "3," (c) "2," (d) "1]]

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