An open pipe is suddenly closed at one end with the result that the frequency of third harmonic of the closed pipe is found to be higher by `100 Hz` then the fundamental frequency of the open pipe. The fundamental frequency of the open pipe is

Options

A. `200 Hz`
B. `300 Hz`
C. `240 Hz`
D. `480 Hz`

Answer

A

Explanation

`3. (v)/(4 l) - (v)/(2l) =100 rArr (v)/(4 l) = 100`
Open pipe: `(v)/(2 l) = 100 Hz`