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. continuosly increasing
B. first increases and them become constant
C. continuously decreases
D. first decreases and them become constant

Answer

B

Explanation

`v=nlambda`
`v=n(4l)`
`n=(v)/(4l)`
Inifinally l decreases so frequency increases but at certain instant it becomes constant so frequency become constant