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Q.

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

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a

40 year, 0.9173/year

b

90 year. 9.017/year

c

30 year, 0.0173/year

d

None of these

answer is D.

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Detailed Solution

To reduce one fourth it takes time t=2(T1/2)=2 x 40=80 years.Decay constant λ=0.693T1/2=0.0173 years
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