Question

Suppose you have 60 kg of a radioactive material that decays 50% of its mass every

year. How much material will you have left after 4 years?

Answer 1

Year 1= 60 x .5 =30
Year 2=30 x .5 =15
Year 3=15 x .5 =7.5
Year 4=7.5 x .5 =3.75
The answer is 3.75

Answer 2

8.12 kg

Explanation:

Suppose you have 60 kg of a radioactive material that decays 50% of its mass every year. How much material will you have left after 4 years?