If $8.0 g$ of a radioactive isotope has a half-life of 10 yr. The half-life of $2.0 g$ of the same substance is:

2.5

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5

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20

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10

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Solution

The correct option is D $10$ yr
Half-life is independent of the initial amount, hence half-life of 2.0 g of substance is also 10 yr.

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