CEE Kerala Engineering CEE Kerala Engineering Solved Paper-2010

  • question_answer
    In the total electromagnetic energy falling on a surface is U, then the total momentum delivered (for complete absorption) is

    A)  \[\frac{U}{c}\]                                 

    B)  \[cU\]

    C)  \[\frac{U}{{{c}^{2}}}\]                  

    D)         \[{{c}^{2}}U\]

    E)  \[\sqrt{\frac{U}{c}}\]

    Correct Answer: A

    Solution :

    The object gains an energy\[\Delta U\]from radiation. Maxwell showed that the object also gains linear momentum, the magnitude\[\Delta p\]or the change in momentum of the object is related to the energy change U by \[\Delta p=\frac{U}{c}\]


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