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[" A source of frequency v gives "5" bea...

[" A source of frequency v gives "5" beats/second when sounded with a source of frequency "200Hz" .The second "],[" harmonic of frequency "2v" of source gives "10" beats fecond when sounded with a source of frequency "420Hz" .The "],[" value of "v" is "],[[" (A) "205Hz," (B) "195Hz," (C) "200Hz," (D) "210Hz]]

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