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[" 42.A sample of rock from moon contain...

[" 42.A sample of rock from moon contains equal number of "14],[" atoms of uranium and lead "(t_(1/2)" for "U=4.5times10^(9)" years)."],[" The age of the rock would be: "],[[" (a) "9.0times10^(9)" years "," (b) "4.5times10^(9)" year "],[" (c) "13.5times10^(9)" years "," (d) "2.25times10^(9)" years "]]

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