Radioactivity
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PHXII13:NUCLEI

363987 The decay constant which is the reciprocal of the time duration for which the number of the atoms of radioactive substance falls to

1 \({17 \%}\) of its original value
2 \({27 \%}\) of its original value
3 \({37 \%}\) of its original value
4 \({47 \%}\) of its original value
PHXII13:NUCLEI

363988 The half-life of \(^{215}At\) is \(100\,\mu s\) . The time taken for the radioactivity of a sample of \(^{215}At\) to decay \(1/16th\) of its initial value is

1 \(400\,\mu s\)
2 \(6.3\,\mu s\)
3 \(40\,\mu s\)
4 \(300\,\mu s\)
PHXII13:NUCLEI

363989 The half-life of a radioactive substance is \(\tau=20\) days. What is the probability of the decay of a nucleus in 1 year?
[Take \({e}^{-0.038}=0.963, \ln 2=0.693\) ]

1 \(2.5\,\% \)
2 \(3.7\,\% \)
3 \(5.6\,\% \)
4 \(1.8\,\% \)
PHXII13:NUCLEI

363990 A radioactive sample has half-life of 3 years. The time required for the activity of the sample to reduce to \(\dfrac{1}{5}^{\text {th }}\) of its initial value is about

1 15 years
2 5 years
3 10 years
4 7 years
KCET - 2023
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PHXII13:NUCLEI

363987 The decay constant which is the reciprocal of the time duration for which the number of the atoms of radioactive substance falls to

1 \({17 \%}\) of its original value
2 \({27 \%}\) of its original value
3 \({37 \%}\) of its original value
4 \({47 \%}\) of its original value
PHXII13:NUCLEI

363988 The half-life of \(^{215}At\) is \(100\,\mu s\) . The time taken for the radioactivity of a sample of \(^{215}At\) to decay \(1/16th\) of its initial value is

1 \(400\,\mu s\)
2 \(6.3\,\mu s\)
3 \(40\,\mu s\)
4 \(300\,\mu s\)
PHXII13:NUCLEI

363989 The half-life of a radioactive substance is \(\tau=20\) days. What is the probability of the decay of a nucleus in 1 year?
[Take \({e}^{-0.038}=0.963, \ln 2=0.693\) ]

1 \(2.5\,\% \)
2 \(3.7\,\% \)
3 \(5.6\,\% \)
4 \(1.8\,\% \)
PHXII13:NUCLEI

363990 A radioactive sample has half-life of 3 years. The time required for the activity of the sample to reduce to \(\dfrac{1}{5}^{\text {th }}\) of its initial value is about

1 15 years
2 5 years
3 10 years
4 7 years
KCET - 2023
For More Updates join with Us
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PHXII13:NUCLEI

363987 The decay constant which is the reciprocal of the time duration for which the number of the atoms of radioactive substance falls to

1 \({17 \%}\) of its original value
2 \({27 \%}\) of its original value
3 \({37 \%}\) of its original value
4 \({47 \%}\) of its original value
PHXII13:NUCLEI

363988 The half-life of \(^{215}At\) is \(100\,\mu s\) . The time taken for the radioactivity of a sample of \(^{215}At\) to decay \(1/16th\) of its initial value is

1 \(400\,\mu s\)
2 \(6.3\,\mu s\)
3 \(40\,\mu s\)
4 \(300\,\mu s\)
PHXII13:NUCLEI

363989 The half-life of a radioactive substance is \(\tau=20\) days. What is the probability of the decay of a nucleus in 1 year?
[Take \({e}^{-0.038}=0.963, \ln 2=0.693\) ]

1 \(2.5\,\% \)
2 \(3.7\,\% \)
3 \(5.6\,\% \)
4 \(1.8\,\% \)
PHXII13:NUCLEI

363990 A radioactive sample has half-life of 3 years. The time required for the activity of the sample to reduce to \(\dfrac{1}{5}^{\text {th }}\) of its initial value is about

1 15 years
2 5 years
3 10 years
4 7 years
KCET - 2023
NEET DIGITAL LIBRARY
PHXII13:NUCLEI

363987 The decay constant which is the reciprocal of the time duration for which the number of the atoms of radioactive substance falls to

1 \({17 \%}\) of its original value
2 \({27 \%}\) of its original value
3 \({37 \%}\) of its original value
4 \({47 \%}\) of its original value
PHXII13:NUCLEI

363988 The half-life of \(^{215}At\) is \(100\,\mu s\) . The time taken for the radioactivity of a sample of \(^{215}At\) to decay \(1/16th\) of its initial value is

1 \(400\,\mu s\)
2 \(6.3\,\mu s\)
3 \(40\,\mu s\)
4 \(300\,\mu s\)
PHXII13:NUCLEI

363989 The half-life of a radioactive substance is \(\tau=20\) days. What is the probability of the decay of a nucleus in 1 year?
[Take \({e}^{-0.038}=0.963, \ln 2=0.693\) ]

1 \(2.5\,\% \)
2 \(3.7\,\% \)
3 \(5.6\,\% \)
4 \(1.8\,\% \)
PHXII13:NUCLEI

363990 A radioactive sample has half-life of 3 years. The time required for the activity of the sample to reduce to \(\dfrac{1}{5}^{\text {th }}\) of its initial value is about

1 15 years
2 5 years
3 10 years
4 7 years
KCET - 2023
Join With Us for More Updates