Modern Physics 3 Question 9

9. Half-life of a radioactive substance A is 4 days. The probability that a nucleus will decay in two half-lives is

(a) 14

(b) 34

(c) 12

(d) 1

(2006, 3M)

Show Answer

Solution:

  1. After two half lives 14 th fraction of nuclei will remain undecayed. Or, 34 th fraction will decay. Hence, the probability that a nucleus decays in two half lives is 34.
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