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Question

If 2 g of an isotope has a half-life period of 7 days, the half -life period of 1 g sample is:

A
3.5 days
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B
7 days
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C
14 days
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D
28 days
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Solution

The correct option is A 7 days
If 2 g of an isotope has a half-life period of 7 days, the half -life period of 1 g sample is 7 days. Radioactive decay is first order process for which half life period is independent of initial concentration (or mass or number of moles) of isotope.

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