Radioactivity
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PHXII13:NUCLEI

363965 The half life of a radioactive substance is 20 minutes. In how much time, the activity of substance drops to \(\left(\dfrac{1}{16}\right)^{\text {th }}\) of its initial value?

1 40 minutes
2 60 minutes
3 80 minutes
4 20 minutes
NEET - 2023
PHXII13:NUCLEI

363966 A radioactive isotope has a half-life of \(T\) years. How long will it take the activity to reduce to 3.125% and 1%?

1 \(9.5\,T\,{\rm{and}}\,5\,T\)
2 \(5\,T\,{\rm{and}}\,6.65\,T\)
3 \(4.5\,T\,{\rm{and}}\,7.5\,T\)
4 \(5\,T\,{\rm{and}}\,9.5\,T\)
NCERT Exemplar
PHXII13:NUCLEI

363967 The radioactivity of a given sample of scotch due to tritium (half-life 12 years) was found to be only 3% of that measured in a recently purchased bottle marked “7 years old”. The sample must have been prepared about

1 67 years back
2 220 years back
3 300 years back
4 400 years back
PHXII13:NUCLEI

363968 A mixture consists of two radioactive materials \({A_1}\) and \({A_2}\) with half lives of \(20\,s\) and \(10\,s\) respectively. Initially the mixture has \(40g\) of \({A_1}\) and \(160g\) of \({A_2}\). The amount of the two in the mixture will become equal after

1 \(60\,s\)
2 \(80\,s\)
3 \(20\,s\)
4 \(40\,s\)
PHXII13:NUCLEI

363969 If \(20 \%\) of a radioactive substance decay in 10 days. The amount of the original material left after 30 days is

1 \(51.2 \%\)
2 \(62.6 \%\)
3 \(15 \%\)
4 \(21.2 \%\)
NEET DIGITAL LIBRARY
PHXII13:NUCLEI

363965 The half life of a radioactive substance is 20 minutes. In how much time, the activity of substance drops to \(\left(\dfrac{1}{16}\right)^{\text {th }}\) of its initial value?

1 40 minutes
2 60 minutes
3 80 minutes
4 20 minutes
NEET - 2023
PHXII13:NUCLEI

363966 A radioactive isotope has a half-life of \(T\) years. How long will it take the activity to reduce to 3.125% and 1%?

1 \(9.5\,T\,{\rm{and}}\,5\,T\)
2 \(5\,T\,{\rm{and}}\,6.65\,T\)
3 \(4.5\,T\,{\rm{and}}\,7.5\,T\)
4 \(5\,T\,{\rm{and}}\,9.5\,T\)
NCERT Exemplar
PHXII13:NUCLEI

363967 The radioactivity of a given sample of scotch due to tritium (half-life 12 years) was found to be only 3% of that measured in a recently purchased bottle marked “7 years old”. The sample must have been prepared about

1 67 years back
2 220 years back
3 300 years back
4 400 years back
PHXII13:NUCLEI

363968 A mixture consists of two radioactive materials \({A_1}\) and \({A_2}\) with half lives of \(20\,s\) and \(10\,s\) respectively. Initially the mixture has \(40g\) of \({A_1}\) and \(160g\) of \({A_2}\). The amount of the two in the mixture will become equal after

1 \(60\,s\)
2 \(80\,s\)
3 \(20\,s\)
4 \(40\,s\)
PHXII13:NUCLEI

363969 If \(20 \%\) of a radioactive substance decay in 10 days. The amount of the original material left after 30 days is

1 \(51.2 \%\)
2 \(62.6 \%\)
3 \(15 \%\)
4 \(21.2 \%\)
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PHXII13:NUCLEI

363965 The half life of a radioactive substance is 20 minutes. In how much time, the activity of substance drops to \(\left(\dfrac{1}{16}\right)^{\text {th }}\) of its initial value?

1 40 minutes
2 60 minutes
3 80 minutes
4 20 minutes
NEET - 2023
PHXII13:NUCLEI

363966 A radioactive isotope has a half-life of \(T\) years. How long will it take the activity to reduce to 3.125% and 1%?

1 \(9.5\,T\,{\rm{and}}\,5\,T\)
2 \(5\,T\,{\rm{and}}\,6.65\,T\)
3 \(4.5\,T\,{\rm{and}}\,7.5\,T\)
4 \(5\,T\,{\rm{and}}\,9.5\,T\)
NCERT Exemplar
PHXII13:NUCLEI

363967 The radioactivity of a given sample of scotch due to tritium (half-life 12 years) was found to be only 3% of that measured in a recently purchased bottle marked “7 years old”. The sample must have been prepared about

1 67 years back
2 220 years back
3 300 years back
4 400 years back
PHXII13:NUCLEI

363968 A mixture consists of two radioactive materials \({A_1}\) and \({A_2}\) with half lives of \(20\,s\) and \(10\,s\) respectively. Initially the mixture has \(40g\) of \({A_1}\) and \(160g\) of \({A_2}\). The amount of the two in the mixture will become equal after

1 \(60\,s\)
2 \(80\,s\)
3 \(20\,s\)
4 \(40\,s\)
PHXII13:NUCLEI

363969 If \(20 \%\) of a radioactive substance decay in 10 days. The amount of the original material left after 30 days is

1 \(51.2 \%\)
2 \(62.6 \%\)
3 \(15 \%\)
4 \(21.2 \%\)
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NEET Test Series from KOTA - 10 Papers In MS WORD WhatsApp Here
PHXII13:NUCLEI

363965 The half life of a radioactive substance is 20 minutes. In how much time, the activity of substance drops to \(\left(\dfrac{1}{16}\right)^{\text {th }}\) of its initial value?

1 40 minutes
2 60 minutes
3 80 minutes
4 20 minutes
NEET - 2023
PHXII13:NUCLEI

363966 A radioactive isotope has a half-life of \(T\) years. How long will it take the activity to reduce to 3.125% and 1%?

1 \(9.5\,T\,{\rm{and}}\,5\,T\)
2 \(5\,T\,{\rm{and}}\,6.65\,T\)
3 \(4.5\,T\,{\rm{and}}\,7.5\,T\)
4 \(5\,T\,{\rm{and}}\,9.5\,T\)
NCERT Exemplar
PHXII13:NUCLEI

363967 The radioactivity of a given sample of scotch due to tritium (half-life 12 years) was found to be only 3% of that measured in a recently purchased bottle marked “7 years old”. The sample must have been prepared about

1 67 years back
2 220 years back
3 300 years back
4 400 years back
PHXII13:NUCLEI

363968 A mixture consists of two radioactive materials \({A_1}\) and \({A_2}\) with half lives of \(20\,s\) and \(10\,s\) respectively. Initially the mixture has \(40g\) of \({A_1}\) and \(160g\) of \({A_2}\). The amount of the two in the mixture will become equal after

1 \(60\,s\)
2 \(80\,s\)
3 \(20\,s\)
4 \(40\,s\)
PHXII13:NUCLEI

363969 If \(20 \%\) of a radioactive substance decay in 10 days. The amount of the original material left after 30 days is

1 \(51.2 \%\)
2 \(62.6 \%\)
3 \(15 \%\)
4 \(21.2 \%\)
NEET DIGITAL LIBRARY
PHXII13:NUCLEI

363965 The half life of a radioactive substance is 20 minutes. In how much time, the activity of substance drops to \(\left(\dfrac{1}{16}\right)^{\text {th }}\) of its initial value?

1 40 minutes
2 60 minutes
3 80 minutes
4 20 minutes
NEET - 2023
PHXII13:NUCLEI

363966 A radioactive isotope has a half-life of \(T\) years. How long will it take the activity to reduce to 3.125% and 1%?

1 \(9.5\,T\,{\rm{and}}\,5\,T\)
2 \(5\,T\,{\rm{and}}\,6.65\,T\)
3 \(4.5\,T\,{\rm{and}}\,7.5\,T\)
4 \(5\,T\,{\rm{and}}\,9.5\,T\)
NCERT Exemplar
PHXII13:NUCLEI

363967 The radioactivity of a given sample of scotch due to tritium (half-life 12 years) was found to be only 3% of that measured in a recently purchased bottle marked “7 years old”. The sample must have been prepared about

1 67 years back
2 220 years back
3 300 years back
4 400 years back
PHXII13:NUCLEI

363968 A mixture consists of two radioactive materials \({A_1}\) and \({A_2}\) with half lives of \(20\,s\) and \(10\,s\) respectively. Initially the mixture has \(40g\) of \({A_1}\) and \(160g\) of \({A_2}\). The amount of the two in the mixture will become equal after

1 \(60\,s\)
2 \(80\,s\)
3 \(20\,s\)
4 \(40\,s\)
PHXII13:NUCLEI

363969 If \(20 \%\) of a radioactive substance decay in 10 days. The amount of the original material left after 30 days is

1 \(51.2 \%\)
2 \(62.6 \%\)
3 \(15 \%\)
4 \(21.2 \%\)