Saved Bookmarks
| 1. |
The isotopes .^(238)U and .^(235)U occur in nature in the mass ratio 140 : 1. it is assumed that intially they were found in equal mass. If half life (t_(1//2)) of .^(238)U=4.5xx10^(9) and t_(1//2) of .^(235)Uxx10^(8)years respectively then the age of earth is (log 7=0.846,log2=0.3) |
|
Answer» `4.02xx10^(9)` YEAR |
|