i know it is very easy but hard for me can someone explain it
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YOUR ANSWER IS (D).Neutron has no charge, hence e/m is zero for neutron. Next, ∝-particle (He2+) has very high mass compared to proton and electron, therefore very small e/m ratio. Proton and electron have same charge (magnitude) but former is heavier, hence has smaller value of e/m. e/m : n < ∝ < p < e .
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this is the answer for ur question.
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