A sufficiently long closed organ pipe has a small hole at its bottom . Initially , the pipe is empty . Water is poured into the pipe at a constant rate . The fundamental frequency of the air column in the pipe

Options

A. continuously increases
B. first increases and then becomes constant
C. continuously decreases
D. first decreases and then becomes constant

Answer

B

Explanation

Fundamental frequency of a `COP` is given by
`f_(0) = (v)/( 4 l)`
length `l` of air column will first decrease and then becomes constant ( when rate or inflow = rate of outflow). Therefore , `f_(0)` will first increases and then become constant.