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The half - life of a radioactive substan...

The half - life of a radioactive substance is 50 days. The substance will disintegrate completely in

A

`40 yr,0.9173//yr`

B

`90yr,9.017//yr`

C

`80yr,0.0173//yr`

D

None of these

Text Solution

Verified by Experts

The correct Answer is:
C
To reduce one-fourth it takes time, `t=2(T_(1//2))=2xx40=80yr`
So, decay constant, `lamda(0.693)/(T_(1//2))=(0.963)/(40)=0.0173yr`
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