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RAJASTHAN ­ PET Rajasthan PET Solved Paper-2004

  • question_answer
    If the distance between a point light source and screen is decrease one-third, then the relation between intensity of light \[\left( I \right)\] and initial light\[({{I}_{0}})\] will be

    A)  \[I=\frac{{{I}_{0}}}{3}\]

    B)  \[I=\frac{{{I}_{0}}}{9}\]

    C)  \[I={{I}_{0}}\]

    D)  \[I=9{{I}_{0}}\]

    Correct Answer: D

    Solution :

     \[I\propto \frac{1}{{{r}^{2}}}\] \[\frac{I}{{{I}_{0}}}={{\left( \frac{r}{r/3} \right)}^{2}}\] \[I=9{{I}_{0}}\]


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