Four open organ pipes of different lengths 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 ${\gamma _{c{o_2}}} = 7/5$]
  • A$f_A/f_B =\sqrt 2 $
  • B$f_C/f_D = \sqrt {72/28}$
  • C$f_B/f_C =\sqrt {11/28}$
  • D$f_D/f_A =\sqrt {71/11}$
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