Question on: JAMB Physics - 2006
A radioactive element has a half life of 4 days. The fraction that has decayed in 16 days is?
A
(15)/16
B
(1)/16
C
(3)/4
D
(1)/4
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Correct Option: A
16 days = 4 half lives.
The fraction left 16 days = after 4 half live, = (1/2)4 = (1)/16.
∴ fraction delayed = (15)/16
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