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,
← IIT-JEE 2012 · Paper 1
PhysicsMultiple correct+4Question 15 of 60
IIT-JEE 2012 · Paper 1, Physics question 15
Answer and worked solution
Official answer: B, D
Reflection of a pressure pulse.
At an open end the pressure is held at atmospheric (a pressure node), so the reflected pressure pulse is inverted: a compression returns as a rarefaction (low-pressure pulse).
At a closed end the displacement is zero (a pressure antinode), so the pulse reflects without inversion: a compression returns as a compression.
(A) False. (B) True. (C) False. (D) True.
(B), (D)