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) 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 travelling 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

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