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Question

A pulse (shown here) is first reflected from the free end A and then from the rigid end B. The phase difference between initial incident pulse and final reflected pulse after two reflections is


Correct Answer
A
π
Your Answer
B
2π
Your Answer
C
0 
Your Answer
D
3π 

Solution

The correct option is A π
1st reflection :
The end A is free, therefore, pulse gets reflected without any inversion. So, phase change is zero.

2nd reflection :
The end B is fixed, therefore, reflected pulse has phase difference of π.

After two reflections, resultant phase difference is π between initial and final pulses.

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