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A person blowsinto open-end of a long pipe. As a result, a high-pressure pulseof air travels down the pipe. Whenthis pulse reachesthe other endof the pipe,
a high-pressure pulsestarts traveling up the pipe, if the other end of the pipe is open.
a low-pressure pulsestarts traveling up the pipe, if the other end ofthe pipe is open.
alow-pressure pulsestarts traveling up the pipe, if the other end of the pipe is closed.
a high-pressure pulse starts traveling up the pipe, if the other end of the pipe is closed.
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