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The half-life of cobalt 60 is 5.3 years. What fraction of a sample remains after 21.2 years? A. one half B. one quarter C. one eighth D. one sixteenth

The half-life of cobalt 60 is 5.3 years. What fraction of a sample remains after 21.2 years? A. one half B. one quarter C. one eighth D. one sixteenth
asked 142k views
1 vote
The half-life of cobalt 60 is 5.3 years. What fraction of a sample remains after 21.2 years?

A.
one half
B.
one quarter
C.
one eighth
D.
one sixteenth

asked
User Biswajit Biswas
by
8.1k points

1 Answer

1 vote
As given
21.2 / 5.3 = 4 times.
Hence,
The answer would be
(1/2)^ 4
=1/16
So the answer is D
answered
User Mlbright
by
7.8k points
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