Q.

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

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a

A proton and a neutron

b

A proton and deuterium

c

A deuterium and an α-particle

d

An electron and γ-rays

answer is C.

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Detailed Solution

Deuterium          α-particleq       +1e                      +2em    1p + 1n              2p + 2nem    12mp                 12mpSo, deuterium and an α-particle have identical value of e/m.
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Which of the following pairs have identical values of e/m?