Which of the following pairs have identical value of $e / m$ ?

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An electron and $Y$ -rays

Deuterium nucleus and an a-particle

A proton and a neutron

A proton and deuterium

answer is C.

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Detailed Solution

Identical value of $e l m$ is Deuterium nucleus and an a-particle.

According to the charge and mass of the substances being compared, the charge to mass ratio is determined. The protons and neutrons of a -particle are two each. One proton and one neutron are present in deuterium. Their e/m values are therefore the same.

Hence, correct option is C.

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