Q. What is minimum length of a tube, open at both ends, that resonates with tuning fork of frequency $350\ Hz\ ?$ [velocity of sound in air $= 350\ m/s$]
A) $50\ cm$
B) $100\ cm$
C) $75\ cm$
D) $25\ cm$
Explanation
(a) Fundamental frequency $n = \frac{v}{2l}$
$\Rightarrow 350 = \frac{350}{2l} \Rightarrow l = \frac{1}{2}m = 50cm$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.