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Question

Increasing order (lowest first) for the values of $${e}/{m}$$ (charge / mass) for electron $$\left(e\right)$$, proton $$\left(p\right)$$, neutron $$\left(n\right)$$ and $$\alpha$$-particle $$\left( \alpha\right)$$ 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 $$n, \alpha, p, e$$
Increasing order (lowest first) for the values of e/m (charge / mass) for electron (e), proton (p), neutron (n) and α-particle (α) is $$\displaystyle n, \alpha, p, e$$
e/m for neutron $$\displaystyle = \dfrac {0}{1}= 0$$
e/m for alpha particle $$\displaystyle = \dfrac {2}{4} = 0.5$$
e/m for proton $$\displaystyle = \dfrac {1}{1} = 1$$
e/m for electron $$\displaystyle = \dfrac {1}{(\dfrac {1}{1850}) } = 1850$$
Note: e is the charge of the particle, m is the mass of a particle and the mass of an electron is $$\dfrac {1}{1850}$$ times the mass of proton.

Hence, the correct option is $$D$$

Chemistry

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