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JEE Main & Advanced Physics Wave Mechanics Question Bank Progressive Waves

  • question_answer
    If amplitude of waves at distance r from a point source is A, the amplitude at a distance 2r will be [MP PMT 1985]

    A)            2A 

    B)            A

    C)            A/2

    D)            A/4

    Correct Answer: C

    Solution :

               \[I\propto {{A}^{2}}\propto \frac{1}{{{d}^{2}}}\]Þ \[A\propto \frac{1}{d}\]


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