The half-life period of a radioactive element is 1 h. After 3 h, what fraction of it will remain?
The half-life period of a radioactive element is 1 h. After 3 h, what fraction of it will remain?
A. `(1)/(8)`
B. `(1)/(16)`
C. `(1)/(64)`
D. `(1)/(9)`
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Correct Answer - A
Amount of undercayed material, `x=((1)/(2))^(t//T)`
`" "["where, t= timetaken, T=half -life time"]`
`thereforex=((1)/(2))^(3//1)=(1)/(8)`
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