Law of Radioactive decay
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NUCLEAR PHYSICS

147842 $N$ atoms of a radioactive element emit $n$ - alpha particles per second. The half-life of the element is

1 $\frac{\mathrm{n}}{\mathrm{N}} \mathrm{s}$
2 $\frac{\mathrm{N}}{\mathrm{n}} \mathrm{s}$
3 $\frac{0.693 \mathrm{~N}}{\mathrm{n}} \mathrm{s}$
4 $\frac{0.693 \mathrm{n}}{\mathrm{N}} \mathrm{s}$
UP CPMT-2006
NUCLEAR PHYSICS

147843 If a radioactive substance decays $\frac{1}{16}$ th of its original amount in $2 \mathrm{~h}$, then the half-life of that substance is

1 $15 \mathrm{~min}$
2 $30 \mathrm{~min}$
3 $45 \mathrm{~min}$
4 None of these
CG PET- 2006
NUCLEAR PHYSICS

147844 In a mean life of a radioactive sample

1 about $\frac{1}{3}$ of the substance disintegrates
2 about $\frac{2}{3}$ of the substance disintegrates
3 about $90 \%$ of the substance disintegrates
4 almost all of the substance disintegrates
CG PET- 2005
NUCLEAR PHYSICS

147845 Assertion: If the half life of a radioactive substance is $\mathbf{4 0}$ days then $\mathbf{2 5 \%}$ substance decay in 20 days.
Reason: $\quad \mathrm{N}=\mathrm{N}_{\mathbf{0}}\left(\frac{1}{2}\right)^{\mathrm{n}}$
where, $\mathbf{n}=\frac{\text { time elapsed }}{\text { half life period }}$

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-1998
NEET DIGITAL LIBRARY
NUCLEAR PHYSICS

147842 $N$ atoms of a radioactive element emit $n$ - alpha particles per second. The half-life of the element is

1 $\frac{\mathrm{n}}{\mathrm{N}} \mathrm{s}$
2 $\frac{\mathrm{N}}{\mathrm{n}} \mathrm{s}$
3 $\frac{0.693 \mathrm{~N}}{\mathrm{n}} \mathrm{s}$
4 $\frac{0.693 \mathrm{n}}{\mathrm{N}} \mathrm{s}$
UP CPMT-2006
NUCLEAR PHYSICS

147843 If a radioactive substance decays $\frac{1}{16}$ th of its original amount in $2 \mathrm{~h}$, then the half-life of that substance is

1 $15 \mathrm{~min}$
2 $30 \mathrm{~min}$
3 $45 \mathrm{~min}$
4 None of these
CG PET- 2006
NUCLEAR PHYSICS

147844 In a mean life of a radioactive sample

1 about $\frac{1}{3}$ of the substance disintegrates
2 about $\frac{2}{3}$ of the substance disintegrates
3 about $90 \%$ of the substance disintegrates
4 almost all of the substance disintegrates
CG PET- 2005
NUCLEAR PHYSICS

147845 Assertion: If the half life of a radioactive substance is $\mathbf{4 0}$ days then $\mathbf{2 5 \%}$ substance decay in 20 days.
Reason: $\quad \mathrm{N}=\mathrm{N}_{\mathbf{0}}\left(\frac{1}{2}\right)^{\mathrm{n}}$
where, $\mathbf{n}=\frac{\text { time elapsed }}{\text { half life period }}$

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-1998
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NUCLEAR PHYSICS

147842 $N$ atoms of a radioactive element emit $n$ - alpha particles per second. The half-life of the element is

1 $\frac{\mathrm{n}}{\mathrm{N}} \mathrm{s}$
2 $\frac{\mathrm{N}}{\mathrm{n}} \mathrm{s}$
3 $\frac{0.693 \mathrm{~N}}{\mathrm{n}} \mathrm{s}$
4 $\frac{0.693 \mathrm{n}}{\mathrm{N}} \mathrm{s}$
UP CPMT-2006
NUCLEAR PHYSICS

147843 If a radioactive substance decays $\frac{1}{16}$ th of its original amount in $2 \mathrm{~h}$, then the half-life of that substance is

1 $15 \mathrm{~min}$
2 $30 \mathrm{~min}$
3 $45 \mathrm{~min}$
4 None of these
CG PET- 2006
NUCLEAR PHYSICS

147844 In a mean life of a radioactive sample

1 about $\frac{1}{3}$ of the substance disintegrates
2 about $\frac{2}{3}$ of the substance disintegrates
3 about $90 \%$ of the substance disintegrates
4 almost all of the substance disintegrates
CG PET- 2005
NUCLEAR PHYSICS

147845 Assertion: If the half life of a radioactive substance is $\mathbf{4 0}$ days then $\mathbf{2 5 \%}$ substance decay in 20 days.
Reason: $\quad \mathrm{N}=\mathrm{N}_{\mathbf{0}}\left(\frac{1}{2}\right)^{\mathrm{n}}$
where, $\mathbf{n}=\frac{\text { time elapsed }}{\text { half life period }}$

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-1998
For More Updates join with Us
NEET Test Series from KOTA - 10 Papers In MS WORD WhatsApp Here
NUCLEAR PHYSICS

147842 $N$ atoms of a radioactive element emit $n$ - alpha particles per second. The half-life of the element is

1 $\frac{\mathrm{n}}{\mathrm{N}} \mathrm{s}$
2 $\frac{\mathrm{N}}{\mathrm{n}} \mathrm{s}$
3 $\frac{0.693 \mathrm{~N}}{\mathrm{n}} \mathrm{s}$
4 $\frac{0.693 \mathrm{n}}{\mathrm{N}} \mathrm{s}$
UP CPMT-2006
NUCLEAR PHYSICS

147843 If a radioactive substance decays $\frac{1}{16}$ th of its original amount in $2 \mathrm{~h}$, then the half-life of that substance is

1 $15 \mathrm{~min}$
2 $30 \mathrm{~min}$
3 $45 \mathrm{~min}$
4 None of these
CG PET- 2006
NUCLEAR PHYSICS

147844 In a mean life of a radioactive sample

1 about $\frac{1}{3}$ of the substance disintegrates
2 about $\frac{2}{3}$ of the substance disintegrates
3 about $90 \%$ of the substance disintegrates
4 almost all of the substance disintegrates
CG PET- 2005
NUCLEAR PHYSICS

147845 Assertion: If the half life of a radioactive substance is $\mathbf{4 0}$ days then $\mathbf{2 5 \%}$ substance decay in 20 days.
Reason: $\quad \mathrm{N}=\mathrm{N}_{\mathbf{0}}\left(\frac{1}{2}\right)^{\mathrm{n}}$
where, $\mathbf{n}=\frac{\text { time elapsed }}{\text { half life period }}$

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-1998