Question

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

Answer 1

Answer: (A)

f

Answer 2

(i) Here, $\frac{\lambda}{2}=l$
$\Rightarrow \lambda=2 l$
So, $v=\frac{v}{21}$

(ii) and $\frac{\lambda}{4}=\frac{l}{2}$
$\lambda=\frac{4 l}{2}=2 l$
$\therefore v_{2}=\frac{v}{2 l}$, the same.
$\therefore f$ (original) is the frequency.