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  4. 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,

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Q. 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,

JEE AdvancedJEE Advanced 2012

Solution:

At the open end, the phase of a pressure wave changes by $\pi$ radian due to reflection. At the closed end, there is no change in the phase of a pressure wave due to reflection.