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jee

Half-life of a radio active substance ' AA ' is 4 days. The...

1
Half-life of a radio active substance ' AA ' is 4 days. The probability that a nucleus will decay in two half-lives is

1414

3434

1212

1
Solution:
After two half lives 1414 th fraction of nuclei will remain undecayed. Or, 3434 th fraction will decay. Hence, the probability that a nucleus decays in two half lives is 3434.