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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

6400 years

B

2400 years

C

3200 years

D

4800 years

Text Solution

Verified by Experts

The correct Answer is:
C
`{:(M_0=100g,"(initial mass )"),("M=25g","(active mass)"):}}rArrN_0/N=100/25`
`Delta=2^2rArr n=2`
Therefore required time =`2xxT_(1//2)`=3200 yrs
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