Question

a sample of material has 40000 radioactive particles today, your father measured 80000, 40 years later, what will it be in 40 years and 80 years. I do not know what decay to use to solve this problem

Answer 1

40,000 and 80,000 are nice, round, related numbers, aren't they?

Answer 2

thats not helpful

Answer 3

how much is 40,000 compared to 80,000?

I think it's quite helpful