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Four open organ popes of different lengt...

Four open organ popes of different length and different gases at same temperature as shown in figure. Let `f_(A),f_(B),f_(C)` and `f_(D)` be their fundamental frequencies then : [Take `gamma_(CO_(2)) = 7//5`]
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The correct Answer is:
C
`f=(sqrt(gammaRT))/(2Lsqrt(M))=(k)/(Lsqrt(M)),f_(A)=(k)/(Lsqrt(2))`
`f_(B)=(2k)/(Lsqrt(32)),f_(c)=(3k)/(2Lsqrt(28))`
`f_(D)=(3k)/(Lsqrt(44)),:. f_(C)//f_(D)=sqrt((11)/(28))`
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