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[" 172.A source of unknown frequency giv...

[" 172.A source of unknown frequency gives "4" beatls,"],[" when sounded with a source of known frequency "],[250Hz" .The second harmonic of the source of "],[" unknown frequency gives "5" beatls,when sounded "],[" with a source of frequency "513Hz" .The unknown "],[" frequency is "],[[" (a) "254Hz," (b) "246Hz," (c) "240Hz," (d) "260Hz]]

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