Question

half life of plutonium-239 is 24,300 years. if a nuclear bomb released 8kg of this isotope, how many years would pass before the amt is reduced to 1kg

Answer 1

8:2=4kg in 24.300 years

4:2=2 kg in other 24.300 years

2:2=1kg in other 24.300 years

Total time= 72900 years