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Question

A radioactive substance has a half life of four months, Three fourth of the substance will decay in

A
three months
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B
four months
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C
eight months
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D
twelve months
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Solution

The correct option is D eight months
Substance left undecayed, N034N0=14N0
NN0=14=(12)n
Number of atoms left undecided, n=2 i.e, in two half lives
t=nT=2×4=8 months

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