Question

100g of. A radioactive mass has a half.life of 5 days calculate the mass decayed.off after 15.day

Answer 1

After 15 days, three half-lives would have passed.

So, the mass decayed after 15 days can be calculated as follows:

1st half-life: 50g remains, 50g decayed
2nd half-life: 25g remains, 25g decayed
3rd half-life: 12.5g remains, 12.5g decayed

So, after 15 days, 87.5g of the radioactive mass would have decayed.