In an ore containing uranium, the ratio (by number) of U-238 to Pb-...

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In an ore containing uranium, the ratio (by number) of U-238 to Pb-206 is 3. Assuming that all the lead present in the ore is the final stable product of \( U-238 \). If age of the ore is \( 1.868 \times 10^{\mathrm{n}} \) years, then value of the \( n \) (Take the half life of \( U-238 \) to be \( 4.5 \times 10^{9} \) years. ( \( (\mathrm{n} 4 / 3=0.2876) \) )
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