147870 A radioactive substance contains 10000 nuclei and its half-life period is 20 days. the number of nuclei present at the end of $\mathbf{1 0}$ days is

147872 What is the age of an ancient wooden piece? If it is known that the specific activity of $\mathrm{C}^{14}$ nuclide in its amounts is $3 / 5$ of that in freshly grown trees? Given the half of $\mathrm{C}$ nuclide is $5570 \mathrm{yr}$.

147873 Two radioactive materials $x_{1}$ and $x_{2}$ have decay constants $10 \lambda$ and $\lambda$ respectively. if initially they have the same number of nuclei, then the ratio of the number of nuclei of $x_{1}$ to that of $x_{2}$ will be $1 / \mathrm{e}$ after a time

147874 A certain radioactive material ${ }_{z} X^{A}$ starts emitting $\alpha$ and $\beta$ particles successively such that the end product is $\mathrm{Z}-3^{\mathrm{A}} \mathrm{Y}^{\mathrm{A}-8}$ The number of $\alpha$ and $\beta$ particles emitted are

147875 An observer ' $A$ ' sees as asteroid with a radioactive element moving by at a speed $=0.3 \mathrm{c}$ and measures the radioactivity decay time to be $T_{A}$. another observer ' $B$ ' is moving with the asteroid and measures its decay time as $T_{B}$. Then $T_{A}$ and $T_{B}$ are related as below

147870 A radioactive substance contains 10000 nuclei and its half-life period is 20 days. the number of nuclei present at the end of $\mathbf{1 0}$ days is

147872 What is the age of an ancient wooden piece? If it is known that the specific activity of $\mathrm{C}^{14}$ nuclide in its amounts is $3 / 5$ of that in freshly grown trees? Given the half of $\mathrm{C}$ nuclide is $5570 \mathrm{yr}$.

147873 Two radioactive materials $x_{1}$ and $x_{2}$ have decay constants $10 \lambda$ and $\lambda$ respectively. if initially they have the same number of nuclei, then the ratio of the number of nuclei of $x_{1}$ to that of $x_{2}$ will be $1 / \mathrm{e}$ after a time

147874 A certain radioactive material ${ }_{z} X^{A}$ starts emitting $\alpha$ and $\beta$ particles successively such that the end product is $\mathrm{Z}-3^{\mathrm{A}} \mathrm{Y}^{\mathrm{A}-8}$ The number of $\alpha$ and $\beta$ particles emitted are

147875 An observer ' $A$ ' sees as asteroid with a radioactive element moving by at a speed $=0.3 \mathrm{c}$ and measures the radioactivity decay time to be $T_{A}$. another observer ' $B$ ' is moving with the asteroid and measures its decay time as $T_{B}$. Then $T_{A}$ and $T_{B}$ are related as below

147870 A radioactive substance contains 10000 nuclei and its half-life period is 20 days. the number of nuclei present at the end of $\mathbf{1 0}$ days is

147872 What is the age of an ancient wooden piece? If it is known that the specific activity of $\mathrm{C}^{14}$ nuclide in its amounts is $3 / 5$ of that in freshly grown trees? Given the half of $\mathrm{C}$ nuclide is $5570 \mathrm{yr}$.

147873 Two radioactive materials $x_{1}$ and $x_{2}$ have decay constants $10 \lambda$ and $\lambda$ respectively. if initially they have the same number of nuclei, then the ratio of the number of nuclei of $x_{1}$ to that of $x_{2}$ will be $1 / \mathrm{e}$ after a time

147874 A certain radioactive material ${ }_{z} X^{A}$ starts emitting $\alpha$ and $\beta$ particles successively such that the end product is $\mathrm{Z}-3^{\mathrm{A}} \mathrm{Y}^{\mathrm{A}-8}$ The number of $\alpha$ and $\beta$ particles emitted are

147875 An observer ' $A$ ' sees as asteroid with a radioactive element moving by at a speed $=0.3 \mathrm{c}$ and measures the radioactivity decay time to be $T_{A}$. another observer ' $B$ ' is moving with the asteroid and measures its decay time as $T_{B}$. Then $T_{A}$ and $T_{B}$ are related as below

147870 A radioactive substance contains 10000 nuclei and its half-life period is 20 days. the number of nuclei present at the end of $\mathbf{1 0}$ days is

147872 What is the age of an ancient wooden piece? If it is known that the specific activity of $\mathrm{C}^{14}$ nuclide in its amounts is $3 / 5$ of that in freshly grown trees? Given the half of $\mathrm{C}$ nuclide is $5570 \mathrm{yr}$.

147873 Two radioactive materials $x_{1}$ and $x_{2}$ have decay constants $10 \lambda$ and $\lambda$ respectively. if initially they have the same number of nuclei, then the ratio of the number of nuclei of $x_{1}$ to that of $x_{2}$ will be $1 / \mathrm{e}$ after a time

147874 A certain radioactive material ${ }_{z} X^{A}$ starts emitting $\alpha$ and $\beta$ particles successively such that the end product is $\mathrm{Z}-3^{\mathrm{A}} \mathrm{Y}^{\mathrm{A}-8}$ The number of $\alpha$ and $\beta$ particles emitted are

147875 An observer ' $A$ ' sees as asteroid with a radioactive element moving by at a speed $=0.3 \mathrm{c}$ and measures the radioactivity decay time to be $T_{A}$. another observer ' $B$ ' is moving with the asteroid and measures its decay time as $T_{B}$. Then $T_{A}$ and $T_{B}$ are related as below

147870 A radioactive substance contains 10000 nuclei and its half-life period is 20 days. the number of nuclei present at the end of $\mathbf{1 0}$ days is

147872 What is the age of an ancient wooden piece? If it is known that the specific activity of $\mathrm{C}^{14}$ nuclide in its amounts is $3 / 5$ of that in freshly grown trees? Given the half of $\mathrm{C}$ nuclide is $5570 \mathrm{yr}$.

147873 Two radioactive materials $x_{1}$ and $x_{2}$ have decay constants $10 \lambda$ and $\lambda$ respectively. if initially they have the same number of nuclei, then the ratio of the number of nuclei of $x_{1}$ to that of $x_{2}$ will be $1 / \mathrm{e}$ after a time

147874 A certain radioactive material ${ }_{z} X^{A}$ starts emitting $\alpha$ and $\beta$ particles successively such that the end product is $\mathrm{Z}-3^{\mathrm{A}} \mathrm{Y}^{\mathrm{A}-8}$ The number of $\alpha$ and $\beta$ particles emitted are

147875 An observer ' $A$ ' sees as asteroid with a radioactive element moving by at a speed $=0.3 \mathrm{c}$ and measures the radioactivity decay time to be $T_{A}$. another observer ' $B$ ' is moving with the asteroid and measures its decay time as $T_{B}$. Then $T_{A}$ and $T_{B}$ are related as below