The half life period of Pb^(210) is 22 y...

The half life period of `Pb^(210)` is 22 years. If `2 g` of `Pb^(210)` is taken, then after 11 years the amount of `Pb^(210)` will be present is

A

1.414 g

B

2.428 g

C

3.442 g

D

4.456 g

Verified by Experts

The correct Answer is:

D

`25 = [1/2]^n xx 200 , [1/2]^n = (25)/(200) = 1/8 = [1/2]^3`
n= 3 , Number of half lives = 3
so time required `= 3 xx 5760 = 17280 yr`

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