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[" A tuging fork "A" produces "4" beats/...

[" A tuging fork "A" produces "4" beats/sec,with another runing fork "B" of frequency "320" cps on filling "],[" fork "A" ,"4" beats/second are again heard Then the frequency of fork A before filling (ing) (ings (in coss) is "],[([11],[(C)320])quad [" (B) "324],[" (D) "324]]

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