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MHT CET Physics question

PhysicsWavesMHT CET

A wave travelling along positive X-axis is given by . If it is reflected from rigid boundary such that 80% amplitude is reflected, then equation of reflected wave is

Answer: (B)

Solution

Reflection from a rigid boundary reverses the direction ( changes sign) and introduces a phase change of (a minus sign), and the amplitude becomes

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Question ID VK-070239