Question

Que:- A radioactive element has a half-life of 15 years. What is the fraction that will decay in 30 years?
a) 0.5 b) 0.75 c) 0.2 d) 0.25​

Answer 1

After each period of half life amount of radioactive element is reduced by a factor of 1/2 so after 2 half lifes 1/2*1/2 = 1/4 is left, 3/4 decayed.

Answer 2

Explanation:

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