Fundamental frequency in close/organ pipe
(f)=4ℓvf1=4ℓ1v&f2=4ℓ2v
Beat =(f1−f2)=4v(ℓ11−ℓ21)
15=4v(11−1.21)v=(0.215×4×1.2)=60×6=360 m/s
JEE Main 2025 — Physics Waves & Oscillations
In the resonance experiment, two air columns (closed at one end) of 100 cm and 120 cm long, give 15 beats per second when each one is sounding in the respective fundamental modes. The velocity of sound in the air column is :
Held on 3 Apr 2025 · Verified 6 Jul 2026.
335 m/s
370 m/s
340 m/s
360 m/s
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