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Question

Equation of a plane progressive wave is given by y=A1sin π(tx3). After reflecting from a rarer medium amplitude of reflected wave becomes A2. The equation of the reflected wave can be 


A
A1sin π(t+x3)
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B
A2sin π(tk3+1)
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C
A2cos π(t+x3)
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D
A2sin π(t+x3)
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Solution

The correct option is C A2sin π(t+x3)
As waves enters from denser to rarer medium therefore reflected will not be inverted .
Also, the reflected wave will have same speed but propagate in opposite direction to the incident wave.
yr=A2sin π(t+x3)

Physics

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