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JEE Advanced · 2012 · 08 Apr 2012 · Paper 1 · Waves & Sound

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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,
  1. (A)a high-pressure pulse starts traveling up the pipe, if the other end of the pipe is open.
  2. (B)a low-pressure pulse starts traveling up the pipe, if the other end of the pipe is open.✓ Correct
  3. (C)a low-pressure pulse starts traveling up the pipe, if the other end of the pipe is closed.
  4. (D)a high-pressure pulse starts traveling up the pipe, if the other end of the pipe is closed.✓ Correct

Answer: (B), (D)

Solution

At an open end, a pressure wave undergoes a phase change of radians upon reflection, so a high-pressure pulse reflects as a low-pressure pulse. At a closed end, there is no phase change, so a high-pressure pulse reflects as a high-pressure pulse. Options (B) and (D) are correct.

JEE Advanced · 2012 · 08 Apr 2012 · Paper 1 · One or more correct options

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