A closed pipe resonates at its fundmental frequency of `300 Hz`. Which one of the following statements is wrong ?

Options

A. if the temperature rises, the fundamental frequency increases.
B. if the pressure rises, the fundamental frequency increases.
C. The first overtone is of frequency `900 Hz`.
D. An open pipe with the same fundamental frequency has twice the length.

Answer

B

Explanation

`f_("fun") = {{:((V)/(2l) "for open pipe"),((v)/(4l) "for closed pipe"):}`
`f prop sqrt(T)`, but `f` does not depend on pressure.
for closed pipe `f_(1st "overtone") = 3f_("fundamental")`