A radioactive substance has a half life of 4 hours. What fraction of the original
substance will decay after 3 half lives?
(1) 1/8
(3)1/4
(2) 7/8
(4) 3/4
Answers
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Answer:
After 1 half life, remaining substance = 1/2
After 2 half life, remaining substance = (1/2)/2=1/4
After 3 half life, remaining substance = (1/4)/2=1/8
Amount decayed = original - remaining
= 1-1/8
=(8-1)/8
= 7/8
Answer (2) 7/8
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