Recent content by DEANS2

thanks！

my calculation is correct？

there is the Q:If you could take a 1 kg handful of the matter in the universe 3 minutes after the big bang, approximately how much would be lithium nuclei?

I have tried it before. 1kgx4x10^(-10)=4x10^(-10)kg. However the answer is 0.4mg=4x10^(-7)kg how to get it?

So It is 1kg x 2 parts in 10 billion？

2-5 parts in 10 billion

how about in 7Li. there isn't have%

I have table show that

your mean is 1kg x 2x10^-5？but the answer is 250g. I only have the answer. I don't know how to get it

Homework Statement the relative concentration by mass of helium at 3 minutes after the big bang is 2-5 parts per 100,000. If you had 1 kilogram of the normal matter from the universe at a time 3 minutes after the big bang, how much of it would be normal helium nuclei? Homework EquationsThe...