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JAMB Physics 2021 Paper
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© africaexams.com
Question : 16
Total: 40
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?
24 years
20 years
10 years
2 years
Validate
Solution:
Given amount remaining =
1
64
=
1
64
=
1
(
2
)
6
∴
=
120
years
6
= 20 years
⇒
T
1
2
= 20 years
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