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NEET NEET SOLVED PAPER 2019

  • question_answer
    Ionized hydrogen atoms and \[\alpha \]-particles with same momenta enters perpendicular to a constant magnetic field, B. The ratio of their radii of their paths \[{{r}_{H}}:{{r}_{\alpha }}\]will be: [NEET 5-5-2019]

    A) 4 : 1

    B)               1 : 4

    C) 2 : 1     

    D) 1 : 2

    Correct Answer: C

    Solution :

    \[r=\frac{mv}{qB}=\frac{p}{qB}\]             \[r\propto \frac{1}{q}\]             \[\frac{{{r}_{H}}}{{{r}_{\alpha }}}=\frac{{{q}_{\alpha }}}{{{q}_{H}}}=\frac{2e}{e}\]             \[{{r}_{H}}:{{r}_{\alpha }}=2:1\]                    


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