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  3. Uttarakhand PMT

Uttarakhand PMT Uttarakhand PMT Solved Paper-2011

  • question_answer
    If the amplitude of a wave at a distance r from a point source is A, the amplitude at a distance 2 r will be

    A)  \[2A\]           

    B)  A

    C)  \[\frac{A}{2}\]

    D)  \[\frac{A}{4}\]

    Correct Answer: C

    Solution :

     \[I\propto {{A}^{2}}\] Also,     \[I\propto \frac{1}{{{r}^{2}}}\] (inverse square law) \[A\propto \frac{1}{r}\] \[\therefore \] \[A=\frac{A}{2}\]


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