Radioactivity of a sample (z = 22) decreases 90% after 10 years. What – McqOptions

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1.	Radioactivity of a sample (z = 22) decreases 90% after 10 years. What will be the half-life of the sample?
A.	2 years
B.	5 years
C.	3 years
D.	10 years
Answer» D. 10 years

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