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Q.

A sound wave travelling along an air column of a pipe gets reflected at the open end of the pipe. What is the phase difference between the incident and reflected waves at the open end?

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a

2π

b

π/2

c

π

d

3π

answer is A.

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Detailed Solution

When a longitudinal pressure wave is reflected at the open end the phase changes by π. Thus, compression becomes rarefaction.

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