Physics > 2009 > 47
JAMB UTME
A piece of radioactive material contains 1020 atoms. If the half life of the material is 20 seconds, the number of disintegrations in the first second is
A.
3.47 x 1018
B.
6.93 x 1020
C.
3.47 x 1020
D.
6.93 x 1018
Answer: A
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