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1900's Physics and Wave

A wave pulse ...

Question

A wave pulse on a string has the dimension shown in figure. The wave speed is v = 1 cm/s. If the right end of the string is a free end. The shape of wave at time t = 3s is :

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 D
After reflection from free end, the wave is in phase. Constructive interference takes places.

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