Question

A glass tube 1.0 m length is filled with water. The water can be drained out slowly at the bottom of the tube. If a vibrating tuning fork of frequency 500 c/s, is brought at the upper end of the tube, and the velocity of sound is 330 m/s, then the total number of resonances obtained will be

• A. 4
• B. 3
• C. 2
• D. 1

Answer 1

Answer: (B)

3

$\lambda =\frac{V}{f}=\frac{330}{500}=0.66m$

$\therefore$ Resonances occuring are $\frac{\lambda }{2},\lambda$ and $\frac{3\lambda }{2}$