Atoms And Nuclei Question 269

Question: If one were to apply Bohr model to a particle of mass ’m’ and charge ‘q’ moving in a plane under the influence of a magnetic field ‘B’, the energy of the charged particle in the nth level will be:

Options:

A) $ n( \frac{hqB}{2\pi m} ) $

B) $ n( \frac{hqB}{8\pi m} ) $

C) $ n( \frac{hqB}{4\pi m} ) $

D) $ n( \frac{hqB}{\pi m} ) $

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Answer:

Correct Answer: C

Solution:

  • $ qVB=\frac{mv^{2}}{r} $

    and $ \frac{nh}{2\pi }=mvr $ Multiplying equation (i) and (ii),

    $ \frac{qBnh}{2\pi }=m^{2}v^{2} $

    Now multiplying both sides by $ \frac{1}{2m} $ ,

    $ n\frac{qBh}{4\pi m}=\frac{1}{2}mv^{2}\text{ i}\text{.e}\text{. }KE=n[ \frac{qBh}{4\pi m} ] $



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