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Question

Then increasing order for the value of e/m for the electron, proton, neutron and α particle is:

A
e,p,n,α
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B
n,p,e,α
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C
n,p,α,e
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D
n,α,p,e
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Solution

The correct option is D n,α,p,e
Since the neutron has no charge, it's e/m value is zero.
α particle has very high mass occupied to the electron as well as proton there will be a very small e/m ratio.
Proton and electron have the same charge (q=1.6×1019 C ) but the former is just heavier, therefore it has a smaller value of e/m.

Mass of proton, mp=1.67×1027Kg

Mass of electron, me=9.1×1031Kg

mp>me

(e/m)e>(e/m)p

So, the correct order is n,α,p,e

Hence, the correct option is D.

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