Question

A cylindrical tube, open at both ends, has a fundamental frequency $f_0$, in air. The tube is dipped vertically into water such that half of its length is inside water. The fundamental frequency of the air column now is

• A.
• B.
• C.
• D.

Answer 1

The correct option is B

For the open tube

$f_0=\frac{v}{2l}$

For the closed tube

$f_0^1=\frac{v}{4⟮\frac{l}{2}⟯}=f_0$