The fundamental frequency of a closed organ pipe is equal to the first overtone frequency of an open organ pipe. If length of the open pipe is $60 \mathrm{~cm}$, the length of the closed pipe will be :
  • A$60 \mathrm{~cm}$
  • B$45 \mathrm{~cm}$
  • C$30 \mathrm{~cm}$
  • D$15 \mathrm{~cm}$
JEE MAIN 2024, Diffcult
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