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Question

A pulse (shown here) is reflected from the rigid wall A and then from free end B. The shape of the string after these 2 reflections will be -

A
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B
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C
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D
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Solution

The correct option is B
1st reflection :
The end A is fixed, therefore, reflected pulse has phase difference of π, hence pulse get erect.
2nd reflection :
The end B is free, therefore, pulse gets reflected without any kind of inversion.

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