question 1.---------->Geologists can estimate the age of rocks by their uranium-

Question

question 1.---------->Geologists can estimate the age of rocks by their uranium-238 content. The uranium is incorporated in the rock as it hardens and then decays with first-order kinetics and a half-life of 4.5 billion years. A rock is found to contain 82.1% of the amount of uranium-238 that it contained when it was formed. (The amount that the rock contained when it was formed can be deduced from the presence of the decay products of U- 238.) _____________________________________________________________________ How old is the rock? Express your answer using two significant figures. t = _____ yr __________________________________________________________________________________________________ question 2.

Explanation / Answer

Qn:1)t= 25.72billion year, Qn:2)k=6.244 (M^-1) .(s^-1)

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