Q.
A hollow cylinder with both sides open generates a frequency $f$ in air. When the cylinder vertically immersed into water by half its length the frequency will be
A) $f$
B) $2f$
C) $f/2$
D) $f/4$
Explanation
(a) [image:15_image50.emf]
(i) $\frac{\lambda}{2} = l \Rightarrow \lambda = 2l$
$v = \frac{v}{2l}$
(ii) $\frac{\lambda}{4} = \frac{l}{2}$
$\lambda = \frac{4l}{2} = 2l$
$\therefore v = \frac{v}{2l},$ the same frequency
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.