Question

An open pipe of length 'l' vibrates in fundamental mode. The pressure variation is maximum at

• A. 1/4 from ends
• B. the middle of pipe
• C. the ends of pipe
• D. at 1/8 from ends of pipe

Answer 1

The correct option is B the middle of pipe

The figure shows the formation of pressure wave in the open pipe when it is vibrating in fundamental mode.
The figure indicates that pressure variation is minimum at the ends of open pipe i.e pressure node is formed at the ends of open pipe whereas pressure variation is maximum at the middle of the pipe, so pressure antinode is formed at the middle of th eopen pipe.