CHEM - Uranium isotope relative abundance at diff times (1 Viewer)

Users Who Are Viewing This Thread (Users: 0, Guests: 1)

1. The problem statement, all variables and given/known data

The relative abundance of uranium isotopes in today’s earth crustal material is:
99.2745% 238U
0.7196% 235U
0.0055% 234U
What were the relative abundances when the earth was formed 4.6x109 years ago?

2. Relevant equations

t = age = 1/lambda * ln(N/No)

N = No*e^lambda*t

3. The attempt at a solution

i dont know how to approch this...

I agree with LowlyPion in the other post that you need to know the half-lives and then I think it will be a matter of ratios.

Just post a question the once for the future. This is so people helping you are seeing what everyone is saying and not repeating work that has already been done. We only want to help. :biggrin:

The Bob

The Physics Forums Way

We Value Quality
• Topics based on mainstream science
• Proper English grammar and spelling
We Value Civility
• Positive and compassionate attitudes
• Patience while debating
We Value Productivity
• Disciplined to remain on-topic
• Recognition of own weaknesses
• Solo and co-op problem solving