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[" Two sources "S_(1)" and "S_(2)" of "],[" same frequency "f" emits sound."],[[" The sources are moving as "],[" shown with speed "u" each."A]],[" stationary observer hears that "],[" sound.The beat frequency is "],[(v=" velocity of sound ")],[" (1) "(2u^(2)f)/(v^(2)-u^(2))],[" (2) "(2v^(2)f)/(v^(2)-u^(2))],[" (3) "(2uvf)/(v^(2)-u^(2))],[" (4) "(2u)/(v)f]

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