A radioactive sample of U238 decay to pb through a process for which half-life is 4-5 -109 years- The ratio of number of nuclei of pb to U238 after a time of 4-5 -109 years given 21-3 - 1-26

The weight based ratio of $U^{238}$ and $P b^{226}$ in a sample of rock is 4 : 3. If the half life of $U^{238}$ is $4.5 \times 10^{9}$ years, then the age of rock is:

Q. The weight based ratio of

U^{238}

and

P b^{226}

in a sample of rock in

4 : 3

. If the half life of

U^{238}

4.5 \times 10^{9}

years then the age of rock is

Q. In a sample of rock, the ratio of

^{206} P b

^{238} U

nuclei is found to be 0.5. The age of the rock is (given half-life of

U^{238}

4.5 \times 10^{9}

years)

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A radioactive sample of U238 decay to pb through a process for which half-life is 4.5×109 years. The ratio of number of nuclei of pb to U238 after a time of 4.5×109 years (given213=1.26)

The correct option is C 1:1 After 4.5×109 years which is half life of U238 half of nucleii of U238 convert to Pb. Therefore, required ratio is 1:1.

A radioactive sample of $U^{238}$ decay to pb through a process for which half-life is $4.5 \times 10^{9}$ years. The ratio of number of nuclei of pb to $U^{238}$ after a time of $4.5 \times 10^{9}$ years $(g i v e n 2^{\frac{1}{3}} = 1.26)$

The correct option is C $1 : 1$
$\begin{matrix} After 4.5 \times 10^{9} years which is half life of U^{238} half of nucleii of U^{238} convert to P b . Therefore, required ratio is 1 : 1. \end{matrix}$