A closed organ pipe $150 \mathrm{~cm}$ long gives $7$ beats per second with an open organ pipe of length $350 \mathrm{~cm}$, both vibrating in fundamental mode. The velocity of sound is_________ $\mathrm{m} / \mathrm{s}$.
  • A$754$
  • B$654$
  • C$294$
  • D$354$
JEE MAIN 2024, Diffcult
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