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NEET Sample Paper NEET Sample Test Paper-59

  • question_answer
    A parallel beam of fast moving electrons is incident normally on a narrow slit. A fluorescent screen is placed at a large distance from the slit. If the speed of the electrons is increased, then which of the following is correct?

    A) Diffraction pattern is not observed on the screen in the case of electrons

    B) The angular width of the central maximum of the diffraction pattern will increase

    C) The angular width of the central maximum will decrease

    D) The angular width of the central maxi- mum will be unaffected

    Correct Answer: B

    Solution :

    [b] Angular width \[\propto \frac{1}{\lambda }\] \[\lambda =\frac{h}{mv}\] \[\lambda \propto \frac{h}{mv}\] It velocity of electron increases then \[\lambda \] decreases hence angular width in increases.


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