Question

A person blows into open-end of a long pipe. As a result, a high pressure pulse of air travels down the pipe. When this pulse reaches the other end of the pipe,

• A. a high pressure pulse starts traveling up the pipe, it the other end of the pipe is open.
• B. a low pressure pulse starts traveling up the pipe, if the other end of the pipe is open.
• C. a low pressure pulse starts traveling up the pipe, if the other end ot the pipe is closed.
• D. a high pressure pulse starts traveling up the pipe, if the other end of the pipe is closed.

Answer 1

The correct option is D a high pressure pulse starts traveling up the pipe, if the other end of the pipe is closed.

A pressure wave undergoes a phase change of $\pi$ radians on

reflection from open end of no phase change occurs on reflection from

closed end.