CEE Kerala Engineering CEE Kerala Engineering Solved Paper-2000

  • question_answer
    What is the frequency of a X-ray photon whose momentum is\[1.1\times {{10}^{-23}}kg\text{ }m{{s}^{-2}}\]?

    A)  \[5\times {{10}^{16}}Hz\]    

    B)         \[5\times {{10}^{17}}Hz\]

    C)  \[0.5\times {{10}^{18}}Hz\]   

    D)         \[5\times {{10}^{18}}Hz\]

    E)   \[5\times {{10}^{-16}}Hz\]

    Correct Answer: D

    Solution :

    \[\because \]     \[E=m{{c}^{2}};E=hv\] \[\therefore \]  \[m{{c}^{2}}=hv\]                 \[v=\frac{m{{c}^{2}}}{h}=\frac{1.1\times {{10}^{-23}}\times {{(3\times {{10}^{8}})}^{2}}}{6.6\times {{10}^{-34}}}\]                 \[=5\times {{10}^{18}}Hz\]


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