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A radioactive element has a half life of 4 days. The fraction that has decayed i...


Question

A radioactive element has a half life of 4 days. The fraction that has decayed in 16 days is?

Options

A) (15)/16

B) (1)/16

C) (3)/4

D) (1)/4


The correct answer is A.

Explanation:

16 days = 4 half lives.
The fraction left 16 days = after 4 half live, = (1/2)4 = (1)/16.
∴ fraction delayed = (15)/16

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