Question

2. (5 points ) A living - pound woman contains about 6 x 10 grams of carbon- 14 How many grams of carbon- 14 would remain after 17100 years? What has happened to the rest of the carbon -147 (Assume carbon- 14 is a beta emitter with a half of 5700 years .)

Answer 1

N_i=initial Mass =60g

N_f=Final Mass

$n$ =Half life

Half life($n$) =$\frac{17100}{5700}$ =3 half lifes

$N_f=N_i(0.5)^{3}$

N$_f$ =60(0.5)³=7.5g

The carbon 14 decays hence a decrease because it is unstable.