Question

Which of the following pairs have identical value of e/m?
(1) A proton and a neutron
(2) A proton and a deuteron
(3) Deuteron and an \alpha - particle
(4) An electron and \gamma - rays
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Answer 1

Answer:

an electron and gamma

hope it will help you

Answer 2

Answer:

1) A proton and a neutron

Explanation:

The protons and neutrons have same number of charges in a nucleus but the electron is different