If the fraction of the atoms of a radioactive material left after 120 years is 1/64; what is the half-life of the material?

By: |Published on: Mar 26|Categories: Physics JAMB| 0 comments

A. 24 years
B. 20 years
C. 10 years
D. 2 years

Correct Answer:

Option B = 20 years

Explanation

Given amount remaining = 1/64
= 1/64= (½)6
∴ = 120years/6 = 20 years

⇒ T½ = 20 years

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