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, if the other end of the pipe is closed.
• B. A high-pressure pulse starts traveling up the pipe, if the other end of the pipe is open
• C. A low-prressure pulse starts traveling up the pipe, if the other end of the pipe is open
• D. A low-pressure pulse stats traveling up the pipe, if the other end of the pipe is closed

Answer 1

Answer: (A), (C)

A low-prressure pulse starts traveling up the pipe, if the other end of the pipe is open

At open end, a compression is reflected as a rarefaction.
At closed end, a compression is reflected as a compression.