Question

if 1 kg of u-235 is put on a shelf in a laboratory, how much of it will be left after 700 million years?

Answer 1

Do you know the half-life of U-235?

Answer 2

700 million years

Answer 3

And can you describe what "half-life" means?

Answer 4

I know what the half life is. It's the time it takes for exactly half an amount of a parent element to decay into a daughter element.

Answer 5

Right. So you should be able to answer you question.

Answer 6

500g

Answer 7

lol gebrish... kfujioka was working so hard to get to the answer.. and you just ruined it :X