JEE Advance - Physics (2012 - Paper 1 Offline - No. 13)
A person blows into the 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 high-pressure pulse starts travelling up the pipe, if the other end of the pipe is open.
a low-pressure pulse starts travelling up the pipe, it the other end of the pipe is open.
a low-pressure pulse starts travelling up the pipe, if the other end of the pipe is closed.
a high-pressure pulse starts travelling up the pipe, if the other end of the pipe is closed.
Explanation
The high pressure pulse is a compression pulse. When this gets reflected from a rigid boundary (closed pipe), the reflected pressure wave has the same phase as the incident wave i.e., a compression pulse is reflected as a compression pulse. In case of open pipe, there is a phase change of 180$$^\circ$$ when it is reflected by an open end i.e., a compression pulse is reflected as a rarefaction pulse.
Comments (0)
