1.

Radioactivity of a sample (Z = 22) decreases 90% after 10 years. What will be the half-life of the sample ?

Answer»

5 years
2 years
3 years
10 years

SOLUTION :`k = (2.303)/(t) log (a)/(a - x) = (2.303)/(10) log 100/10`
`k = (2.303)/(10)`
`t_(1//2) = (0.693)/(2.303) XX 10 = 3` YRS.


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