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The half-life a radioacitve substance is...

The half-life a radioacitve substance is `40` yeard. How long will it take to reduce to one fourth of its original amount and what is the value of decay constant ?

A

40 year, 0.9173 /year

B

90 year, 9.017/ year

C

80 year, 0.0173 year

D

None of these

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The correct Answer is:
C
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