A closed organ pipe 150 cm long gives 7 beats per second with an open organ pipe 350 cm long, both vibrating in their fundamental mode. The velocity of sound is m s⁻¹.

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Accepted Answer

294. Closed pipe: f_c=v/(4×1.50)=v/6. Open pipe: fₒ=v/(2×3.50)=v/7. f_c-fₒ=v/6-v/7=v/(42)=7. v=294 m s⁻¹.

A closed organ pipe 150 cm long gives 7 beats per second with an open organ pipe 350 cm long, both vibrating in their fundamental mode. The velocity of sound is ______ m s⁻¹.

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