Question

A radioactive isotope ${m{X}}$ with a half-life of $1.37\,\, 	imes \,\,{10^9}$ years decays to $Y$ which is stable. A sample of rock from the moon was found to contain both the elements $X$ and $Y$ which were in the ratio ${m{1:7}}$. The age of the rock is

Accepted Answer

$4.11\,\, 	imes \,\,{10^9}\,\,years$

Answer

$1.96\,\, 	imes \,\,{10^8}\,\,years$

Answer

$3.85\,\, 	imes \,\,{10^9}\,\,years$

Answer

$9.59\,\, 	imes \,\,{10^9}\,\,years$

JEE PHYSICS MCQ: NUCLEI

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