Question 627: Atoms & Nuclei

Question

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

Accepted Answer

N = N
0
$${\left( {{1 \over 2}} \right)^n}$$
$$ \Rightarrow $$ $${{25} \over {100}}$$ = $${\left( {{1 \over 2}} \right)^n}$$
$$ \Rightarrow $$ n = 2
The total time in which radium change to 25 g is
= 2 ÃÂ 1600 = 3200 yr.

Answer

4800 years

Answer

6400 years

Answer

2400 years

Answer

3200 years

Atoms & Nuclei

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

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