Radioactivity
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PHXII13:NUCLEI

364013 The radioactivity of a sample is \(x\) at time \({t_1}\) and is \(y\) at time \({t_2}\). If the mean life of the specimen is \(\tau \), the number of atoms that have disintegrated in the time interval \(({t_2} - {t_1})\) is:

1 \(x - y\)
2 \((x - y)/\tau \)
3 \((x - y)\tau \)
4 \(x{t_1} - y{t_2}\)
PHXII13:NUCLEI

364014 A radioactive substance emits 100 beta particles in the first 2 seconds and 50 beta particles in the next 2 seconds. The mean life of the sample is

1 4 seconds
2 2 seconds
3 \(\frac{2}{{0.693}}\) second
4 \(2 \times 0.693\) second
KCET - 2013
PHXII13:NUCLEI

364015 The half life of a radioactive substance is \(T\). The time taken, for disintegrating \(\dfrac{7}{8}\) th part of its original mass will be

1 \(T\)
2 \(8 T\)
3 \(3 T\)
4 \(2 T\)
JEE - 2023
PHXII13:NUCLEI

364016 The count rate of a radioactive sample falls from \(4.0 \times 10^{6}\) disintegration/s to \(1.0 \times 10^{6}\) disintegration/s in 20 hours. The count rate after 100 hours from beginning is found to be \({N} \times 10^{3}\) disintegration/s. Find the value of \({N}\) is

1 3.91
2 5.65
3 1.7
4 7.25
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PHXII13:NUCLEI

364013 The radioactivity of a sample is \(x\) at time \({t_1}\) and is \(y\) at time \({t_2}\). If the mean life of the specimen is \(\tau \), the number of atoms that have disintegrated in the time interval \(({t_2} - {t_1})\) is:

1 \(x - y\)
2 \((x - y)/\tau \)
3 \((x - y)\tau \)
4 \(x{t_1} - y{t_2}\)
PHXII13:NUCLEI

364014 A radioactive substance emits 100 beta particles in the first 2 seconds and 50 beta particles in the next 2 seconds. The mean life of the sample is

1 4 seconds
2 2 seconds
3 \(\frac{2}{{0.693}}\) second
4 \(2 \times 0.693\) second
KCET - 2013
PHXII13:NUCLEI

364015 The half life of a radioactive substance is \(T\). The time taken, for disintegrating \(\dfrac{7}{8}\) th part of its original mass will be

1 \(T\)
2 \(8 T\)
3 \(3 T\)
4 \(2 T\)
JEE - 2023
PHXII13:NUCLEI

364016 The count rate of a radioactive sample falls from \(4.0 \times 10^{6}\) disintegration/s to \(1.0 \times 10^{6}\) disintegration/s in 20 hours. The count rate after 100 hours from beginning is found to be \({N} \times 10^{3}\) disintegration/s. Find the value of \({N}\) is

1 3.91
2 5.65
3 1.7
4 7.25
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PHXII13:NUCLEI

364013 The radioactivity of a sample is \(x\) at time \({t_1}\) and is \(y\) at time \({t_2}\). If the mean life of the specimen is \(\tau \), the number of atoms that have disintegrated in the time interval \(({t_2} - {t_1})\) is:

1 \(x - y\)
2 \((x - y)/\tau \)
3 \((x - y)\tau \)
4 \(x{t_1} - y{t_2}\)
PHXII13:NUCLEI

364014 A radioactive substance emits 100 beta particles in the first 2 seconds and 50 beta particles in the next 2 seconds. The mean life of the sample is

1 4 seconds
2 2 seconds
3 \(\frac{2}{{0.693}}\) second
4 \(2 \times 0.693\) second
KCET - 2013
PHXII13:NUCLEI

364015 The half life of a radioactive substance is \(T\). The time taken, for disintegrating \(\dfrac{7}{8}\) th part of its original mass will be

1 \(T\)
2 \(8 T\)
3 \(3 T\)
4 \(2 T\)
JEE - 2023
PHXII13:NUCLEI

364016 The count rate of a radioactive sample falls from \(4.0 \times 10^{6}\) disintegration/s to \(1.0 \times 10^{6}\) disintegration/s in 20 hours. The count rate after 100 hours from beginning is found to be \({N} \times 10^{3}\) disintegration/s. Find the value of \({N}\) is

1 3.91
2 5.65
3 1.7
4 7.25
For More Updates join with Us
PHXII13:NUCLEI

364013 The radioactivity of a sample is \(x\) at time \({t_1}\) and is \(y\) at time \({t_2}\). If the mean life of the specimen is \(\tau \), the number of atoms that have disintegrated in the time interval \(({t_2} - {t_1})\) is:

1 \(x - y\)
2 \((x - y)/\tau \)
3 \((x - y)\tau \)
4 \(x{t_1} - y{t_2}\)
PHXII13:NUCLEI

364014 A radioactive substance emits 100 beta particles in the first 2 seconds and 50 beta particles in the next 2 seconds. The mean life of the sample is

1 4 seconds
2 2 seconds
3 \(\frac{2}{{0.693}}\) second
4 \(2 \times 0.693\) second
KCET - 2013
PHXII13:NUCLEI

364015 The half life of a radioactive substance is \(T\). The time taken, for disintegrating \(\dfrac{7}{8}\) th part of its original mass will be

1 \(T\)
2 \(8 T\)
3 \(3 T\)
4 \(2 T\)
JEE - 2023
PHXII13:NUCLEI

364016 The count rate of a radioactive sample falls from \(4.0 \times 10^{6}\) disintegration/s to \(1.0 \times 10^{6}\) disintegration/s in 20 hours. The count rate after 100 hours from beginning is found to be \({N} \times 10^{3}\) disintegration/s. Find the value of \({N}\) is

1 3.91
2 5.65
3 1.7
4 7.25