The half-life of radium is about 1600 yr...

The half-life of radium is about `1600 yr`. Of `100g` of radium existing now, `25 g` will remain unchanged after

A

2400 years

B

3200 years

C

4800 years

D

6400 years

Verified by Experts

The correct Answer is:

B

Since, `(M)/(M_(0)) = ((1)/(2))^((t)/(T_(1//2))) rArr ((25)/(100)) = ((1)/(2))^((t)/(1600))`
`rArr 2= (t)/(1600) rArr t= 3200` years

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