For a certain organ pipe, the first three resonance frequencies are in the ratio of $1:3:5$ respectively. If the frequency of fifth harmonic is $405\,Hz$ and the speed of sound in air is $324 \,ms ^{-1}$ the length of the organ pipe is $..........m.$
  • A$0$
  • B$2$
  • C$3$
  • D$1$
JEE MAIN 2023, Medium
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