1.

Radioactivity of a sample (Z =22) decrease 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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