Nuclear Physics
UPPCS
The half-life of a radioactive substance is 10 days; it means there will be
(A) Complete decay of substance in 20 days
(B) Complete decay of substance in 40 days
(C) Decay of 3/4 part of substance in 20 days
(D) Decay of 1/4 part of substance in 5 days
Important Facts
- 20 days = 2 half-lives (10 days each). In 2 half-lives, 3/4 decays, 1/4 remains.
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