Question

If an isotope of some element has a half-life of 300 years, about how much of the isotope atoms will be in a sample after 600 years?

PLZ HELP

Answer 1

1/4

i took the test and got it right

Answer 2

half life means a substance gets reduced by 50 % of its value with in the half life period

Here suppose, a element of 100 g has half life of 300 years, so after 300 years, the weight of 100 gm element becomes 50 gm

Again after 600 years, the weight of element will be 50% of its current value thus, it would get reduced to 50/2 = 25 gm

as the weight of element becomes 1/4 of its actual value, the number of atoms also become 1/4th of its actual value.