A radioactive substance has a half-life of 20 d... - JAMB Physics 2006 Question
A radioactive substance has a half-life of 20 days what fraction the original radiation nuclei will remain after 80 days?
A
(1)/32
B
(1)/16
C
(1)/ 8
D
(1)/4
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Correct Option: B
80 days = 4 half lives (i.e 4 x 2odqs = 80 days)
But the fraction always left by any radioactive material after 4half lives is (1/2)4 = (1)/16
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