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Question

The order (lowest to highest) of e/m (charge/mass) ratio for electron (e), proton (p), neutron (n) and alpha particle $$(\alpha)$$ 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 $$n, \alpha, p, e$$

The increasing order (lowest to highest) of e/m (charge/mass) ratio is $$ n < \alpha < p < e$$.
Neutron being neutral has zero charges and lowest e/m ratio. An electron has a unit charge but negligible mass. Hence, the electron has a maximum e/m ratio.
For an alpha particle, the e/m ratio is 2/4 or 0.5.
For proton, e/m ratio is 1/1 or 1.





Chemistry

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