Question

Can u help with tee rock part and plz asap I really need help

Answer 1

Here, Left amount of Uranium = 1/4

So, Number of Half lives gone by = 1/2 / 1/4 = 2

Life after 1 half-life = 1.3 billion years
So, With 2 half-lives, it would be: 1.3 * 2 = 2.6 billion years

In short, The Rock is 2.6 billion Years Old

Hope this helps!

Answer 2

half-life = time in which half of material is lost

1/4 = 1/2 x 1/2 so 2 half lives have gone by if only 1/4 of it is left.

age of rock = 2 x half life = 2x1.3 = 2.6 billion years.