Q. A tuning fork of frequency $330\ Hz$ resonates with an air column of length $120\ cm$ in a cylindrical tube, in the fundamental mode. When water is slowly poured in it, the minimum height of water required for observing resonance once again is (velocity of sound $330ms^{- 1}$)
A) $75\ cm$
B) $60\ cm$
C) $50\ cm$
D) $45\ cm$
Explanation
The correct answer is Option D: $45\ cm$.
A detailed explanation for this question is being prepared.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.