The number of possible natural oscillations of air column in a pipe closed at one end of length $85 \,\,cm$ whose frequencies lie below $1250\,\, Hz$ are (Velocity of sound $= 340 \,\,m s^{-1}$)
  • A$4$
  • B$5$
  • C$6$
  • D$7$
AIPMT 2014,JEE MAIN 2014,AIIMS 2018, Medium
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