Radioactivity
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NUCLEAR PHYSICS

147708 A radioactive substance decays at $1 / 32$ of its initial activity in $\mathbf{2 5}$ days. Its half life is

1 4 days
2 25 days
3 5 days
4 20 days
COMEDK 2015
NUCLEAR PHYSICS

147709 Assertion: The ionising power of $\beta$-particle is less compared to $\alpha$-particles but their penetrating power is more.
Reason: The mass of $\beta$-particle is less then the mass of $\alpha$-particle

1 If both Assertion and Reason are correct and
reason is the correct explanation of Assertion.
2 If both Assertion and Reason are correct, but
Reason is not the correct explanation of
Assertion
3 If Assertion is correct but Reason is incorrect
4 If both the Assertion and Reason are incorrect
AIIMS-2014
NUCLEAR PHYSICS

147712 Assertion: ${ }_{\mathrm{z}} \mathrm{X}^{\mathrm{A}}$ undergoes $2 \alpha$-decays, $2 \beta$ decays and $2 \gamma$-decays and the daughter product is $\mathrm{z}-2 \mathrm{X}^{\mathrm{A}-8}$.
Reason: In $\alpha$-decays the mass number decreases by 4 and atomic number decreases by 2 . In $2 \beta$-decays the mass number remains unchanged, but atomic number increases by 1 only.

1 If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.
2 If both Assertion and Reason are correct but Reason in not a correct explanation of the Assertion.
3 If the Assertion is correct but Reason is incorrect.
4 If both the Assertion and Reason are incorrect.
5 If the Assertion is incorrect but the Reason is correct.
AIIMS-2001
NUCLEAR PHYSICS

147715 Actinium $231,{ }^{231} \mathbf{A c}_{89}$, emit in succession two $\beta$ particles, four alphas, one $\beta$ and one alpha plus several $\gamma$ rays. What is the resultant isotope.

1 ${ }^{221} \mathrm{Au}_{79}$
2 ${ }^{211} \mathrm{Au}_{79}$
3 ${ }^{221} \mathrm{~Pb}_{82}$
4 ${ }^{211} \mathrm{~Pb}_{82}$
AIIMS-2011
NUCLEAR PHYSICS

147710 Assertion: In a decay process of a nucleus, the mass of products is less than that of the parent
Reason: The rest mass energy of the products must be less than that of the parent.

1 If both Assertion and Reason are correct and reason is the correct explanation of Assertion.
2 If both Assertion and Reason are correct, but Reason is not the correct explanation of Assertion
3 If Assertion is correct but Reason is incorrect
4 If both the Assertion and Reason are incorrect
AIIMS-2012
Join With Us for More Updates
NUCLEAR PHYSICS

147708 A radioactive substance decays at $1 / 32$ of its initial activity in $\mathbf{2 5}$ days. Its half life is

1 4 days
2 25 days
3 5 days
4 20 days
COMEDK 2015
NUCLEAR PHYSICS

147709 Assertion: The ionising power of $\beta$-particle is less compared to $\alpha$-particles but their penetrating power is more.
Reason: The mass of $\beta$-particle is less then the mass of $\alpha$-particle

1 If both Assertion and Reason are correct and
reason is the correct explanation of Assertion.
2 If both Assertion and Reason are correct, but
Reason is not the correct explanation of
Assertion
3 If Assertion is correct but Reason is incorrect
4 If both the Assertion and Reason are incorrect
AIIMS-2014
NUCLEAR PHYSICS

147712 Assertion: ${ }_{\mathrm{z}} \mathrm{X}^{\mathrm{A}}$ undergoes $2 \alpha$-decays, $2 \beta$ decays and $2 \gamma$-decays and the daughter product is $\mathrm{z}-2 \mathrm{X}^{\mathrm{A}-8}$.
Reason: In $\alpha$-decays the mass number decreases by 4 and atomic number decreases by 2 . In $2 \beta$-decays the mass number remains unchanged, but atomic number increases by 1 only.

1 If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.
2 If both Assertion and Reason are correct but Reason in not a correct explanation of the Assertion.
3 If the Assertion is correct but Reason is incorrect.
4 If both the Assertion and Reason are incorrect.
5 If the Assertion is incorrect but the Reason is correct.
AIIMS-2001
NUCLEAR PHYSICS

147715 Actinium $231,{ }^{231} \mathbf{A c}_{89}$, emit in succession two $\beta$ particles, four alphas, one $\beta$ and one alpha plus several $\gamma$ rays. What is the resultant isotope.

1 ${ }^{221} \mathrm{Au}_{79}$
2 ${ }^{211} \mathrm{Au}_{79}$
3 ${ }^{221} \mathrm{~Pb}_{82}$
4 ${ }^{211} \mathrm{~Pb}_{82}$
AIIMS-2011
NUCLEAR PHYSICS

147710 Assertion: In a decay process of a nucleus, the mass of products is less than that of the parent
Reason: The rest mass energy of the products must be less than that of the parent.

1 If both Assertion and Reason are correct and reason is the correct explanation of Assertion.
2 If both Assertion and Reason are correct, but Reason is not the correct explanation of Assertion
3 If Assertion is correct but Reason is incorrect
4 If both the Assertion and Reason are incorrect
AIIMS-2012
For More Updates join with Us
NUCLEAR PHYSICS

147708 A radioactive substance decays at $1 / 32$ of its initial activity in $\mathbf{2 5}$ days. Its half life is

1 4 days
2 25 days
3 5 days
4 20 days
COMEDK 2015
NUCLEAR PHYSICS

147709 Assertion: The ionising power of $\beta$-particle is less compared to $\alpha$-particles but their penetrating power is more.
Reason: The mass of $\beta$-particle is less then the mass of $\alpha$-particle

1 If both Assertion and Reason are correct and
reason is the correct explanation of Assertion.
2 If both Assertion and Reason are correct, but
Reason is not the correct explanation of
Assertion
3 If Assertion is correct but Reason is incorrect
4 If both the Assertion and Reason are incorrect
AIIMS-2014
NUCLEAR PHYSICS

147712 Assertion: ${ }_{\mathrm{z}} \mathrm{X}^{\mathrm{A}}$ undergoes $2 \alpha$-decays, $2 \beta$ decays and $2 \gamma$-decays and the daughter product is $\mathrm{z}-2 \mathrm{X}^{\mathrm{A}-8}$.
Reason: In $\alpha$-decays the mass number decreases by 4 and atomic number decreases by 2 . In $2 \beta$-decays the mass number remains unchanged, but atomic number increases by 1 only.

1 If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.
2 If both Assertion and Reason are correct but Reason in not a correct explanation of the Assertion.
3 If the Assertion is correct but Reason is incorrect.
4 If both the Assertion and Reason are incorrect.
5 If the Assertion is incorrect but the Reason is correct.
AIIMS-2001
NUCLEAR PHYSICS

147715 Actinium $231,{ }^{231} \mathbf{A c}_{89}$, emit in succession two $\beta$ particles, four alphas, one $\beta$ and one alpha plus several $\gamma$ rays. What is the resultant isotope.

1 ${ }^{221} \mathrm{Au}_{79}$
2 ${ }^{211} \mathrm{Au}_{79}$
3 ${ }^{221} \mathrm{~Pb}_{82}$
4 ${ }^{211} \mathrm{~Pb}_{82}$
AIIMS-2011
NUCLEAR PHYSICS

147710 Assertion: In a decay process of a nucleus, the mass of products is less than that of the parent
Reason: The rest mass energy of the products must be less than that of the parent.

1 If both Assertion and Reason are correct and reason is the correct explanation of Assertion.
2 If both Assertion and Reason are correct, but Reason is not the correct explanation of Assertion
3 If Assertion is correct but Reason is incorrect
4 If both the Assertion and Reason are incorrect
AIIMS-2012
NEET DIGITAL LIBRARY
NUCLEAR PHYSICS

147708 A radioactive substance decays at $1 / 32$ of its initial activity in $\mathbf{2 5}$ days. Its half life is

1 4 days
2 25 days
3 5 days
4 20 days
COMEDK 2015
NUCLEAR PHYSICS

147709 Assertion: The ionising power of $\beta$-particle is less compared to $\alpha$-particles but their penetrating power is more.
Reason: The mass of $\beta$-particle is less then the mass of $\alpha$-particle

1 If both Assertion and Reason are correct and
reason is the correct explanation of Assertion.
2 If both Assertion and Reason are correct, but
Reason is not the correct explanation of
Assertion
3 If Assertion is correct but Reason is incorrect
4 If both the Assertion and Reason are incorrect
AIIMS-2014
NUCLEAR PHYSICS

147712 Assertion: ${ }_{\mathrm{z}} \mathrm{X}^{\mathrm{A}}$ undergoes $2 \alpha$-decays, $2 \beta$ decays and $2 \gamma$-decays and the daughter product is $\mathrm{z}-2 \mathrm{X}^{\mathrm{A}-8}$.
Reason: In $\alpha$-decays the mass number decreases by 4 and atomic number decreases by 2 . In $2 \beta$-decays the mass number remains unchanged, but atomic number increases by 1 only.

1 If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.
2 If both Assertion and Reason are correct but Reason in not a correct explanation of the Assertion.
3 If the Assertion is correct but Reason is incorrect.
4 If both the Assertion and Reason are incorrect.
5 If the Assertion is incorrect but the Reason is correct.
AIIMS-2001
NUCLEAR PHYSICS

147715 Actinium $231,{ }^{231} \mathbf{A c}_{89}$, emit in succession two $\beta$ particles, four alphas, one $\beta$ and one alpha plus several $\gamma$ rays. What is the resultant isotope.

1 ${ }^{221} \mathrm{Au}_{79}$
2 ${ }^{211} \mathrm{Au}_{79}$
3 ${ }^{221} \mathrm{~Pb}_{82}$
4 ${ }^{211} \mathrm{~Pb}_{82}$
AIIMS-2011
NUCLEAR PHYSICS

147710 Assertion: In a decay process of a nucleus, the mass of products is less than that of the parent
Reason: The rest mass energy of the products must be less than that of the parent.

1 If both Assertion and Reason are correct and reason is the correct explanation of Assertion.
2 If both Assertion and Reason are correct, but Reason is not the correct explanation of Assertion
3 If Assertion is correct but Reason is incorrect
4 If both the Assertion and Reason are incorrect
AIIMS-2012
Join With Us for More Updates
NUCLEAR PHYSICS

147708 A radioactive substance decays at $1 / 32$ of its initial activity in $\mathbf{2 5}$ days. Its half life is

1 4 days
2 25 days
3 5 days
4 20 days
COMEDK 2015
NUCLEAR PHYSICS

147709 Assertion: The ionising power of $\beta$-particle is less compared to $\alpha$-particles but their penetrating power is more.
Reason: The mass of $\beta$-particle is less then the mass of $\alpha$-particle

1 If both Assertion and Reason are correct and
reason is the correct explanation of Assertion.
2 If both Assertion and Reason are correct, but
Reason is not the correct explanation of
Assertion
3 If Assertion is correct but Reason is incorrect
4 If both the Assertion and Reason are incorrect
AIIMS-2014
NUCLEAR PHYSICS

147712 Assertion: ${ }_{\mathrm{z}} \mathrm{X}^{\mathrm{A}}$ undergoes $2 \alpha$-decays, $2 \beta$ decays and $2 \gamma$-decays and the daughter product is $\mathrm{z}-2 \mathrm{X}^{\mathrm{A}-8}$.
Reason: In $\alpha$-decays the mass number decreases by 4 and atomic number decreases by 2 . In $2 \beta$-decays the mass number remains unchanged, but atomic number increases by 1 only.

1 If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.
2 If both Assertion and Reason are correct but Reason in not a correct explanation of the Assertion.
3 If the Assertion is correct but Reason is incorrect.
4 If both the Assertion and Reason are incorrect.
5 If the Assertion is incorrect but the Reason is correct.
AIIMS-2001
NUCLEAR PHYSICS

147715 Actinium $231,{ }^{231} \mathbf{A c}_{89}$, emit in succession two $\beta$ particles, four alphas, one $\beta$ and one alpha plus several $\gamma$ rays. What is the resultant isotope.

1 ${ }^{221} \mathrm{Au}_{79}$
2 ${ }^{211} \mathrm{Au}_{79}$
3 ${ }^{221} \mathrm{~Pb}_{82}$
4 ${ }^{211} \mathrm{~Pb}_{82}$
AIIMS-2011
NUCLEAR PHYSICS

147710 Assertion: In a decay process of a nucleus, the mass of products is less than that of the parent
Reason: The rest mass energy of the products must be less than that of the parent.

1 If both Assertion and Reason are correct and reason is the correct explanation of Assertion.
2 If both Assertion and Reason are correct, but Reason is not the correct explanation of Assertion
3 If Assertion is correct but Reason is incorrect
4 If both the Assertion and Reason are incorrect
AIIMS-2012