When a $β^{-}$ particle is emitted from a nucleus, the neutron-proton ratio:

is decreased

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is increased

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remains the same

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first (A) then (B)

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Solution

The correct option is B is increased
$_{A}^{Z} X$ $\to_{A - 1}^{Z} Y$ $+ β^{- 1}$

So, the neutron-proton ratio before emission $= \frac{Z - A}{A}$

And, the neutron-proton ratio after emission $= \frac{Z - A + 1}{A - 1}$
Since, $\frac{Z - A + 1}{A - 1}$ $> \frac{Z - A}{A}$
Therefore, B is correct option.

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When a β− particle is emitted from a nucleus, the neutron-proton ratio:

The correct option is B is increasedZAX →ZA−1Y +β−1So, the neutron-proton ratio before emission =Z−AAAnd, the neutron-proton ratio after emission =Z−A+1A−1Since, Z−A+1A−1 >Z−AATherefore, B is correct option.

When a $β^{-}$ particle is emitted from a nucleus, the neutron-proton ratio: