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JAMIA MILLIA ISLAMIA Jamia Millia Islamia Solved Paper-2012

  • question_answer
        The minimum wavelength of X-rays emitted by X-rays tube is\[0.4125\text{ }\overset{o}{\mathop{\text{A}}}\,\]. The accelerating voltage is

    A)  30 kV                   

    B)  50 kV

    C)  80 kV                   

    D)  60 kV

    Correct Answer: A

    Solution :

                    From the formula \[eV=h\frac{c}{\lambda }\] \[V=\frac{hc}{e\lambda }=\frac{6.6\times {{10}^{-34}}\times 3\times {{10}^{8}}}{1.6\times {{10}^{-19}}\times 0.4125\times {{10}^{-10}}}\] \[=30\times {{10}^{3}}V=30\,kV\]


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