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NEET Sample Paper NEET Sample Test Paper-30

  • question_answer
    The minimum wavelength of x-rays emitted by x-ray tube is\[0.4125\overset{o}{\mathop{A}}\,\]. The acceleration voltage is:

    A)  30 KV     

    B)  50 KV

    C)  80 KV            

    D)  60 KV

    Correct Answer: A

    Solution :

    Form the formula \[eV=\frac{hc}{\lambda }\]  or  \[V=\frac{hc}{e\lambda }\] Here        \[\lambda =0.4125\overset{\text{o}}{\mathop{\text{A}}}\,\]             \[V=\frac{6.6\times {{10}^{-34}}\times 3\times {{10}^{8}}}{1.6\times {{10}^{-19}}\times 0.4125\times {{10}^{-10}}}\] \[\Rightarrow \]            \[V=30\times {{10}^{3}}\] volt \[=30KV\]             


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