1.

A radioactive isotope .^(40)K with a half-life of 1.26 xx10^(9) years, decay to .^(40)Ar . A sample of rock from the moon was found to contain both element K and Ar and they are in the rartio 1:7.What is the age of the rock?(Neglect decay of .^(40)K to.^(40)Ca)

Answer»

`2.52 XX 10^(9)` year
`(1.26 xx 10^(9))/("In"2) xx "In" ((7)/(8))` year
`(1.26 xx 10^(9))/("In" 2) xx "In" (7) ` year
`3.78 xx 10^(9)` year

Answer :d


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