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Increasing order (lowest first) for the ...

Increasing order (lowest first) for the values of e/m (charge/mass) for electron (e ), proton (p), neutron (n) and `alpha -` particle `(alpha)` is :

A

`e, p, n, alpha`

B

`n, p, e, alpha`

C

`n, p, alpha, e`

D

`n, alpha, p, e`

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The correct Answer is:
D
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