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JEE Main & Advanced Physics Communication System / संचार तंत्र Question Bank Communication

  • question_answer
    A laser beam of pulse power 1012 watt is focussed on an object are 10?4 cm2. The energy flux in watt/ cm2 at the point of focus is                                                       [AFMC 2003]

    A)            1020                                          

    B)            1016

    C)            108

    D)            104

    Correct Answer: B

    Solution :

               The energy flux \[\varphi =\frac{\text{Pulse power }}{\text{Area }}=\frac{{{10}^{12}}}{{{10}^{-4}}}={{10}^{16}}\frac{W}{c{{m}^{2}}}\]


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