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Question

The increasing order of a specific charge to mass ratio of electron(e), proton(p), alpha particle(α) and neutron(n) is:

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

The correct option is B n,α,p,e
The value of charge divided by the mass of an atom or a subatomic particle is called a specific charge.
The charge of a neutron is zero. Hence, its specific charge is zero.
For α:
em=2×1.6022×10194×1.672×1027=4.8×107
For electron:
em=1.6022×10199.109×1031=1.76×1011
For proton:
em=1.6022×10191.672×1027=9.58×107
Order is e>p>α>n

Option C is correct.

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