Radioactive Decay

Natural uranium consists of \({ }^{235} \mathrm{U}\) (percent abundance = 0.7200 %, \(\lambda=3.12 \times 10^{-17} / \mathrm{s}\)) and \({ }^{238} \mathrm{U}\) (percent abundance = 99.27 %, \(\lambda=4.92 \times 10^{-18} / \mathrm{s}\)). What were the values for percent abundance of \({ }^{235} \mathrm{U}\) and \({ }^{238} \mathrm{U}\) when Earth formed \(4.5 \times 10^{9}\) years ago?

Text Transcription:

^235 U

lambda=3.12 times 10^17/s

^238 U

lambda=4.92 times 10^18/s

4.5 times 10^9

Thursday, October 6, 2016 7 Ideas F = m a How far will the car go in 4 sec M = 2 slugs , F = 50 1) a = f/m _______________________ Chapter 15: Circular Motion *3 Ways to Accelerate 1) Make an object move faster 2) Make an object more slower 3) Make a moving object change direction by going around a curve *Centripetal Force:- a real force that pushes inward. (where the tires push the car while steering) *Centrifugal Reaction:- a false force that pushed outward. (reaction) 1