1.

A sample of rock from moon contains equal number of atoms of uranium and lead (t_(1//1) " for " U = 4.5 xx 10^(9) " years"). The age of the rock would be

Answer»

`9.0 xx 10^(9)` years
`4.5 xx 10^(9)` years
`13.5 xx 10^(9)` years
`2.25 xx 10^(9)`years

Solution :`N = (N_(0))/(2^(n)), " use " t = (2.303 xx t_(1//2))/(0.693) " LOG" (N_(0))/(N)`


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