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
B
n,p,e,α
C
n,p,α,e
D
n,α,p,e

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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