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

Options

A. a high-pressure pulse starts travelling up the pipe, if the other end of the pipe is open
B. a low-pressure pulse starts travelling 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 of the pipe is closed.
D. a high-pressure pulse starts travelling up the pipe, if the other end of the pipe is closed.

Answer

B, D

Explanation

At open end phase of pressure wave charge by `pi` so compression returns as rarefraction. While at closed end phaseof pressure wave does not charge so compression return as compression.