147659 Half life of a radioactive substance is 20 minute. Difference between points of time when it is $33 \%$ disintegrated and $67 \%$ disintegrated is approximately

147660 A mixture consists of two radioactive materials $A_{1}$ and $A_{2}$ with half lives of $20 \mathrm{~s}$ and $10 \mathrm{~s}$ respectively. Initially the mixture has $40 \mathrm{~g}$ of $A_{1}$ and $160 \mathrm{~g}$ of $A_{2}$. The amount of the two in the mixture will become equal after

147663 A nucleus of uranium decays at rest into nuclei of thorium and helium. Then :

147664 A radioactive nucleus can decay by two different processes. The half life for the first process is $t_{1}$ and that for the second process is $t_{2}$. If effective half life is $t$, then

147659 Half life of a radioactive substance is 20 minute. Difference between points of time when it is $33 \%$ disintegrated and $67 \%$ disintegrated is approximately

147660 A mixture consists of two radioactive materials $A_{1}$ and $A_{2}$ with half lives of $20 \mathrm{~s}$ and $10 \mathrm{~s}$ respectively. Initially the mixture has $40 \mathrm{~g}$ of $A_{1}$ and $160 \mathrm{~g}$ of $A_{2}$. The amount of the two in the mixture will become equal after

147663 A nucleus of uranium decays at rest into nuclei of thorium and helium. Then :

147664 A radioactive nucleus can decay by two different processes. The half life for the first process is $t_{1}$ and that for the second process is $t_{2}$. If effective half life is $t$, then

147659 Half life of a radioactive substance is 20 minute. Difference between points of time when it is $33 \%$ disintegrated and $67 \%$ disintegrated is approximately

147660 A mixture consists of two radioactive materials $A_{1}$ and $A_{2}$ with half lives of $20 \mathrm{~s}$ and $10 \mathrm{~s}$ respectively. Initially the mixture has $40 \mathrm{~g}$ of $A_{1}$ and $160 \mathrm{~g}$ of $A_{2}$. The amount of the two in the mixture will become equal after

147663 A nucleus of uranium decays at rest into nuclei of thorium and helium. Then :

147664 A radioactive nucleus can decay by two different processes. The half life for the first process is $t_{1}$ and that for the second process is $t_{2}$. If effective half life is $t$, then

147659 Half life of a radioactive substance is 20 minute. Difference between points of time when it is $33 \%$ disintegrated and $67 \%$ disintegrated is approximately

147660 A mixture consists of two radioactive materials $A_{1}$ and $A_{2}$ with half lives of $20 \mathrm{~s}$ and $10 \mathrm{~s}$ respectively. Initially the mixture has $40 \mathrm{~g}$ of $A_{1}$ and $160 \mathrm{~g}$ of $A_{2}$. The amount of the two in the mixture will become equal after

147663 A nucleus of uranium decays at rest into nuclei of thorium and helium. Then :

147664 A radioactive nucleus can decay by two different processes. The half life for the first process is $t_{1}$ and that for the second process is $t_{2}$. If effective half life is $t$, then