Radioactivity
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NUCLEAR PHYSICS

147623 A radioactive substance with decay constant of $0.5 \mathrm{~s}^{-1}$ is being produced at a constant rate of 50 nuclei per second. If there are no nuclei present initially, the time (in second) after which 25 nuclei will be present is

1 1
2 $\ln 2$
3 $\ln (4 / 3)$
4 $2 \ln (4 / 3)$
BITSAT-2018
NUCLEAR PHYSICS

147625 What is the Q-value of the reaction.
$\mathbf{p}+{ }^{7} \mathbf{L i} \rightarrow{ }^{4} \mathrm{He}+{ }^{4} \mathrm{He}$
The atomic masses of ${ }^{1} \mathrm{H},{ }^{4} \mathrm{He}$ and ${ }^{7} \mathrm{Li}$ are $1.007825 \mathrm{u}, \quad 4.002603 \mathrm{u}$ and $7.016004 \mathrm{u}$ respectively

1 $17.35 \mathrm{MeV}$
2 $18.06 \mathrm{MeV}$
3 $177.35 \mathrm{MeV}$
4 $170.35 \mathrm{MeV}$
UP CPMT-2007
NUCLEAR PHYSICS

147624 A radioactive nucleus undergoes a series of decay according to the scheme
$\mathrm{A} \stackrel{\alpha}{\longrightarrow} \mathrm{A}_{1} \stackrel{\beta}{\longrightarrow} \mathrm{A}_{2} \stackrel{\alpha}{\longrightarrow} \mathrm{A}_{3} \stackrel{\gamma}{\longrightarrow} \mathrm{A}_{4}$
If the mass number and atomic number of ' $A$ ' are 180 and 72 respectively, then what are these numbers for $\mathbf{A}_{4}$
#[Qdiff: Medium, QCat: Theory Based, examname: BITSAT-2007, AIIMS-27.05.2018](M)
]#

1 172 and 69
2 174 and 70
3 176 and 69
4 176 and 70
NUCLEAR PHYSICS

147626 Which of the following is emitted when ${ }_{94}^{239} \mathrm{Pu}$ decays into ${ }_{92}^{235} \mathrm{U}$ ?

1 Gamma Ray
2 Neutron
3 Electron
4 Alpha particle
TS EAMCET (Engg.)-2017
NUCLEAR PHYSICS

147627 If $10 \%$ of a radioactive substance decays in every $5 \mathrm{yr}$, then the percentage of the substance that will have decayed in 20 yrs, will be-

1 $40 \%$
2 $50 \%$
3 $65.6 \%$
4 $34.4 \%$
BCECE-2017
Join With Us for More Updates
NUCLEAR PHYSICS

147623 A radioactive substance with decay constant of $0.5 \mathrm{~s}^{-1}$ is being produced at a constant rate of 50 nuclei per second. If there are no nuclei present initially, the time (in second) after which 25 nuclei will be present is

1 1
2 $\ln 2$
3 $\ln (4 / 3)$
4 $2 \ln (4 / 3)$
BITSAT-2018
NUCLEAR PHYSICS

147625 What is the Q-value of the reaction.
$\mathbf{p}+{ }^{7} \mathbf{L i} \rightarrow{ }^{4} \mathrm{He}+{ }^{4} \mathrm{He}$
The atomic masses of ${ }^{1} \mathrm{H},{ }^{4} \mathrm{He}$ and ${ }^{7} \mathrm{Li}$ are $1.007825 \mathrm{u}, \quad 4.002603 \mathrm{u}$ and $7.016004 \mathrm{u}$ respectively

1 $17.35 \mathrm{MeV}$
2 $18.06 \mathrm{MeV}$
3 $177.35 \mathrm{MeV}$
4 $170.35 \mathrm{MeV}$
UP CPMT-2007
NUCLEAR PHYSICS

147624 A radioactive nucleus undergoes a series of decay according to the scheme
$\mathrm{A} \stackrel{\alpha}{\longrightarrow} \mathrm{A}_{1} \stackrel{\beta}{\longrightarrow} \mathrm{A}_{2} \stackrel{\alpha}{\longrightarrow} \mathrm{A}_{3} \stackrel{\gamma}{\longrightarrow} \mathrm{A}_{4}$
If the mass number and atomic number of ' $A$ ' are 180 and 72 respectively, then what are these numbers for $\mathbf{A}_{4}$
#[Qdiff: Medium, QCat: Theory Based, examname: BITSAT-2007, AIIMS-27.05.2018](M)
]#

1 172 and 69
2 174 and 70
3 176 and 69
4 176 and 70
NUCLEAR PHYSICS

147626 Which of the following is emitted when ${ }_{94}^{239} \mathrm{Pu}$ decays into ${ }_{92}^{235} \mathrm{U}$ ?

1 Gamma Ray
2 Neutron
3 Electron
4 Alpha particle
TS EAMCET (Engg.)-2017
NUCLEAR PHYSICS

147627 If $10 \%$ of a radioactive substance decays in every $5 \mathrm{yr}$, then the percentage of the substance that will have decayed in 20 yrs, will be-

1 $40 \%$
2 $50 \%$
3 $65.6 \%$
4 $34.4 \%$
BCECE-2017
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NUCLEAR PHYSICS

147623 A radioactive substance with decay constant of $0.5 \mathrm{~s}^{-1}$ is being produced at a constant rate of 50 nuclei per second. If there are no nuclei present initially, the time (in second) after which 25 nuclei will be present is

1 1
2 $\ln 2$
3 $\ln (4 / 3)$
4 $2 \ln (4 / 3)$
BITSAT-2018
NUCLEAR PHYSICS

147625 What is the Q-value of the reaction.
$\mathbf{p}+{ }^{7} \mathbf{L i} \rightarrow{ }^{4} \mathrm{He}+{ }^{4} \mathrm{He}$
The atomic masses of ${ }^{1} \mathrm{H},{ }^{4} \mathrm{He}$ and ${ }^{7} \mathrm{Li}$ are $1.007825 \mathrm{u}, \quad 4.002603 \mathrm{u}$ and $7.016004 \mathrm{u}$ respectively

1 $17.35 \mathrm{MeV}$
2 $18.06 \mathrm{MeV}$
3 $177.35 \mathrm{MeV}$
4 $170.35 \mathrm{MeV}$
UP CPMT-2007
NUCLEAR PHYSICS

147624 A radioactive nucleus undergoes a series of decay according to the scheme
$\mathrm{A} \stackrel{\alpha}{\longrightarrow} \mathrm{A}_{1} \stackrel{\beta}{\longrightarrow} \mathrm{A}_{2} \stackrel{\alpha}{\longrightarrow} \mathrm{A}_{3} \stackrel{\gamma}{\longrightarrow} \mathrm{A}_{4}$
If the mass number and atomic number of ' $A$ ' are 180 and 72 respectively, then what are these numbers for $\mathbf{A}_{4}$
#[Qdiff: Medium, QCat: Theory Based, examname: BITSAT-2007, AIIMS-27.05.2018](M)
]#

1 172 and 69
2 174 and 70
3 176 and 69
4 176 and 70
NUCLEAR PHYSICS

147626 Which of the following is emitted when ${ }_{94}^{239} \mathrm{Pu}$ decays into ${ }_{92}^{235} \mathrm{U}$ ?

1 Gamma Ray
2 Neutron
3 Electron
4 Alpha particle
TS EAMCET (Engg.)-2017
NUCLEAR PHYSICS

147627 If $10 \%$ of a radioactive substance decays in every $5 \mathrm{yr}$, then the percentage of the substance that will have decayed in 20 yrs, will be-

1 $40 \%$
2 $50 \%$
3 $65.6 \%$
4 $34.4 \%$
BCECE-2017
NEET DIGITAL LIBRARY
NUCLEAR PHYSICS

147623 A radioactive substance with decay constant of $0.5 \mathrm{~s}^{-1}$ is being produced at a constant rate of 50 nuclei per second. If there are no nuclei present initially, the time (in second) after which 25 nuclei will be present is

1 1
2 $\ln 2$
3 $\ln (4 / 3)$
4 $2 \ln (4 / 3)$
BITSAT-2018
NUCLEAR PHYSICS

147625 What is the Q-value of the reaction.
$\mathbf{p}+{ }^{7} \mathbf{L i} \rightarrow{ }^{4} \mathrm{He}+{ }^{4} \mathrm{He}$
The atomic masses of ${ }^{1} \mathrm{H},{ }^{4} \mathrm{He}$ and ${ }^{7} \mathrm{Li}$ are $1.007825 \mathrm{u}, \quad 4.002603 \mathrm{u}$ and $7.016004 \mathrm{u}$ respectively

1 $17.35 \mathrm{MeV}$
2 $18.06 \mathrm{MeV}$
3 $177.35 \mathrm{MeV}$
4 $170.35 \mathrm{MeV}$
UP CPMT-2007
NUCLEAR PHYSICS

147624 A radioactive nucleus undergoes a series of decay according to the scheme
$\mathrm{A} \stackrel{\alpha}{\longrightarrow} \mathrm{A}_{1} \stackrel{\beta}{\longrightarrow} \mathrm{A}_{2} \stackrel{\alpha}{\longrightarrow} \mathrm{A}_{3} \stackrel{\gamma}{\longrightarrow} \mathrm{A}_{4}$
If the mass number and atomic number of ' $A$ ' are 180 and 72 respectively, then what are these numbers for $\mathbf{A}_{4}$
#[Qdiff: Medium, QCat: Theory Based, examname: BITSAT-2007, AIIMS-27.05.2018](M)
]#

1 172 and 69
2 174 and 70
3 176 and 69
4 176 and 70
NUCLEAR PHYSICS

147626 Which of the following is emitted when ${ }_{94}^{239} \mathrm{Pu}$ decays into ${ }_{92}^{235} \mathrm{U}$ ?

1 Gamma Ray
2 Neutron
3 Electron
4 Alpha particle
TS EAMCET (Engg.)-2017
NUCLEAR PHYSICS

147627 If $10 \%$ of a radioactive substance decays in every $5 \mathrm{yr}$, then the percentage of the substance that will have decayed in 20 yrs, will be-

1 $40 \%$
2 $50 \%$
3 $65.6 \%$
4 $34.4 \%$
BCECE-2017
Join With Us for More Updates
NUCLEAR PHYSICS

147623 A radioactive substance with decay constant of $0.5 \mathrm{~s}^{-1}$ is being produced at a constant rate of 50 nuclei per second. If there are no nuclei present initially, the time (in second) after which 25 nuclei will be present is

1 1
2 $\ln 2$
3 $\ln (4 / 3)$
4 $2 \ln (4 / 3)$
BITSAT-2018
NUCLEAR PHYSICS

147625 What is the Q-value of the reaction.
$\mathbf{p}+{ }^{7} \mathbf{L i} \rightarrow{ }^{4} \mathrm{He}+{ }^{4} \mathrm{He}$
The atomic masses of ${ }^{1} \mathrm{H},{ }^{4} \mathrm{He}$ and ${ }^{7} \mathrm{Li}$ are $1.007825 \mathrm{u}, \quad 4.002603 \mathrm{u}$ and $7.016004 \mathrm{u}$ respectively

1 $17.35 \mathrm{MeV}$
2 $18.06 \mathrm{MeV}$
3 $177.35 \mathrm{MeV}$
4 $170.35 \mathrm{MeV}$
UP CPMT-2007
NUCLEAR PHYSICS

147624 A radioactive nucleus undergoes a series of decay according to the scheme
$\mathrm{A} \stackrel{\alpha}{\longrightarrow} \mathrm{A}_{1} \stackrel{\beta}{\longrightarrow} \mathrm{A}_{2} \stackrel{\alpha}{\longrightarrow} \mathrm{A}_{3} \stackrel{\gamma}{\longrightarrow} \mathrm{A}_{4}$
If the mass number and atomic number of ' $A$ ' are 180 and 72 respectively, then what are these numbers for $\mathbf{A}_{4}$
#[Qdiff: Medium, QCat: Theory Based, examname: BITSAT-2007, AIIMS-27.05.2018](M)
]#

1 172 and 69
2 174 and 70
3 176 and 69
4 176 and 70
NUCLEAR PHYSICS

147626 Which of the following is emitted when ${ }_{94}^{239} \mathrm{Pu}$ decays into ${ }_{92}^{235} \mathrm{U}$ ?

1 Gamma Ray
2 Neutron
3 Electron
4 Alpha particle
TS EAMCET (Engg.)-2017
NUCLEAR PHYSICS

147627 If $10 \%$ of a radioactive substance decays in every $5 \mathrm{yr}$, then the percentage of the substance that will have decayed in 20 yrs, will be-

1 $40 \%$
2 $50 \%$
3 $65.6 \%$
4 $34.4 \%$
BCECE-2017