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VMMC VMMC Medical Solved Paper-2011

  • question_answer
    What voltage must be applied to an electron microscope to produce electron of wavelength \[\lambda =1.0\overset{\text{o}}{\mathop{\text{A}}}\,\]?

    A) 12.27 V                

    B) 150 V    

    C)         22500 V          

    D)         4.55 V

    Correct Answer: B

    Solution :

    Given the wavelength of electron \[=1\overset{\text{o}}{\mathop{\text{A}}}\,\text{.}\] The wavelength (in \[\overset{\text{o}}{\mathop{\text{A}}}\,\]) of an electron accelerated through a potential difference of V volts is given by \[\sqrt{\frac{150}{V}}=1\]                 or            \[V=150\,V\]


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