Which of the following pairs have identical values of e/m ? 

  1. A

    A proton and a neutron 

  2. B

    A proton and deuterium

  3. C

    A deuterium and an α-particle 

  4. D

    An electron and γ-rays

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    Solution:

     Deuterium α-particle
    q+1e+2e
    m1p+1n2p+2n
    em12mp12mp

    So, deuterium and an α-particle have identical value of e/m.

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