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Arrange $α - particle (α), electron (e^{-}),$ proton (p) and neutron (n) in increasing order of their e/m value (specific charge, consider magnitude only not sign)

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$e^{-} < p < n < α$

$n < p < α < e^{-}$

$n < α < p < e^{-}$

$α < e^{-} < p < n$

answer is B.

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Detailed Solution

$\frac{e}{m} of n = 0 \frac{e}{m} of α = \frac{1}{2} of e / m of proton \frac{e}{m} of P = 9.58 \times 10^{4} c / g \frac{e}{m} of e^{-} = 1.7588 \times 10^{8} c / g$

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