Question

An open organ pipe of length $l$ vibrates in its fundamental mode. The pressure variation is maximum

• A. At the two ends
• B. At the middle of the pipe
• C. At the distance $\frac{l}{8}$ inside the ends
• D. At the distance $\frac{l}{4}$ inside the ends

Answer 1

Answer: (B)

The first normal mode of vibration is called fundamental mode.


For first normal mode of vibration
$l=\frac{\lambda _{1}}{2}$
Since, the pressure vibration is maximum at node,
Hence, the pressure variation is maximum at the
$x=\frac{l}{2}$