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NEET Sample Paper NEET Sample Test Paper-68

  • question_answer
    Two large parallel plates are connected with the terminal of 100 V power supply. These plates have a fine hole at the centre. An electron having energy 200 eV is so directed that it passes through the holes. When it comes out its, de-Broglie wavelength is

    A) \[1.22\text{ }\overset{{}^\circ }{\mathop{A}}\,\]           

    B)   \[1.75\text{ }\overset{{}^\circ }{\mathop{A}}\,\]

    C) \[2\text{ }\overset{{}^\circ }{\mathop{A}}\,\]                

    D) None of these

    Correct Answer: A

    Solution :

    Energy of the electron, when it comes out from the second plate = 200 eV - 100 eV = 100 eV Hence accelerating potential difference = 100 V \[{{\lambda }_{Electron}}\,\,=\,\,\frac{12.27}{\sqrt{V}}\,=\,\frac{12.27}{\sqrt{100}}\,\,=\,1.23\,\,\overset{{}^\circ }{\mathop{A}}\,\]


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