# An element whose half-life is 3 years has N atoms. How many atoms would...

Question 200
A
1 N atoms8
B
1 N atoms3
C
2 N atoms3
D
5 N atoms6
E
7 N atoms8
##### Explanation
$$\frac{N}{3}$$ = 3years

$$\frac{N}{4}$$ = 6years

$$\frac{N}{8}$$ = 9years

N - $$\frac{N}{8}$$ = $$\frac{7N}{8}$$

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