Question

A person blows onto open-end of a long pipe,As a result, a high pressure pules of air travels down the pipe. When this pules reaches the opther end of the pipe,

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

Answer 1

Answer: (B), (D)

The correct options are
B a low-pressure pules starts travelling up the pipe, if the other end of the pipe is open.
D a high-pressure pules starts travelling up the pipe, if the other end of the pipe is closed.

It is a general inference that a low pressure pulse starts travelling up the pipe if the other end of the pipe is open

a high pressure pulse starts travelling up the pipe, if the other end of the pipe is closed.