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Two tuning fork A and B give 5 beats // ...

Two tuning fork A and B give 5 beats `//` sec. A resounds with a closed column of air 15 cm long and B with an open column of air 30.5 cm long. Calculate their frequecies. Neglect end correction.

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`n_(1)=(upsilon)/(4xx15),n_(2)=(upsilon)/(2xx30.5)=(upsilon)/(61)`
`m=n_(1)-n_(2)=(upsilon)/(60)-(upsilon)/(61)=upsilonxx(1)/(61xx60)`
`5=(upsilon)/(61xx60)`
or `upsilon=5xx61xx60cm//s`
`:. n_(1)=(upsilon)/(60)=(5xx60xx61)/(60)=305Hz`
`n_(2)=(upsilon)/(61)=(5xx50xx61)/(61)=300Hz`
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