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Question: If the half-lives of a radioactive element for a and b decay are 4 year and 12 years respectively, t...

If the half-lives of a radioactive element for a and b decay are 4 year and 12 years respectively, then the percentage of the element that remains after 12 year will be –

A

6.25 %

B

5.25%

C

4.25 %

D

3.50 %

Answer

6.25 %

Explanation

Solution

T = 4×1216\frac { 4 \times 12 } { 16 } = 3 yrs