Radioactivity
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PHXII13:NUCLEI

364008 When a radioactive substance is subjected to a vacuum, the rate of disintegration per second

1 increases considerably
2 is not affected
3 increases only if the products are gases
4 suffers a slight decrease
PHXII13:NUCLEI

364009 1 \(mg\) gold undergoes decay with 2.7 days half-life period, amount left after 8.1 days is

1 \(0.125\,mg\)
2 \(0.5\,mg\)
3 \(0.25\,mg\)
4 \(0.91\,mg\)
PHXII13:NUCLEI

364010 For a radioactive substance, fraction of its initial quantity \(\left(N_{0}\right)\) which will disintegrate in its average life time is about \((e=2.71)\)

1 \(\left(\dfrac{1}{3}\right) N_{0}\)
2 \(\left(\dfrac{2}{3}\right) N_{0}\)
3 \((0.9) N_{0}\)
4 \(\left(\dfrac{1}{2}\right) N_{0}\)
MHTCET - 2022
PHXII13:NUCLEI

364011 In one half-life time duration
I.
Activity of a sample reduced to half of its initial value.
II.
Number of radio active nuclei present is reduced to half of its initial value.
III.
Mass of sample is reduced to half of its initial value.
Out of these, correct statements are

1 I and III
2 I and II
3 I, II and III
4 II and III
PHXII13:NUCLEI

364012 If the half-life of any sample of radioactive susbtance is 4 days, then the fraction of sample will remain undecayed after 2 days, will be

1 \(\sqrt 2 \)
2 \(\frac{1}{{\sqrt 2 }}\)
3 \(\frac{{\sqrt 2 - 1}}{{\sqrt 2 }}\)
4 \(\frac{1}{2}\)
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PHXII13:NUCLEI

364008 When a radioactive substance is subjected to a vacuum, the rate of disintegration per second

1 increases considerably
2 is not affected
3 increases only if the products are gases
4 suffers a slight decrease
PHXII13:NUCLEI

364009 1 \(mg\) gold undergoes decay with 2.7 days half-life period, amount left after 8.1 days is

1 \(0.125\,mg\)
2 \(0.5\,mg\)
3 \(0.25\,mg\)
4 \(0.91\,mg\)
PHXII13:NUCLEI

364010 For a radioactive substance, fraction of its initial quantity \(\left(N_{0}\right)\) which will disintegrate in its average life time is about \((e=2.71)\)

1 \(\left(\dfrac{1}{3}\right) N_{0}\)
2 \(\left(\dfrac{2}{3}\right) N_{0}\)
3 \((0.9) N_{0}\)
4 \(\left(\dfrac{1}{2}\right) N_{0}\)
MHTCET - 2022
PHXII13:NUCLEI

364011 In one half-life time duration
I.
Activity of a sample reduced to half of its initial value.
II.
Number of radio active nuclei present is reduced to half of its initial value.
III.
Mass of sample is reduced to half of its initial value.
Out of these, correct statements are

1 I and III
2 I and II
3 I, II and III
4 II and III
PHXII13:NUCLEI

364012 If the half-life of any sample of radioactive susbtance is 4 days, then the fraction of sample will remain undecayed after 2 days, will be

1 \(\sqrt 2 \)
2 \(\frac{1}{{\sqrt 2 }}\)
3 \(\frac{{\sqrt 2 - 1}}{{\sqrt 2 }}\)
4 \(\frac{1}{2}\)
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PHXII13:NUCLEI

364008 When a radioactive substance is subjected to a vacuum, the rate of disintegration per second

1 increases considerably
2 is not affected
3 increases only if the products are gases
4 suffers a slight decrease
PHXII13:NUCLEI

364009 1 \(mg\) gold undergoes decay with 2.7 days half-life period, amount left after 8.1 days is

1 \(0.125\,mg\)
2 \(0.5\,mg\)
3 \(0.25\,mg\)
4 \(0.91\,mg\)
PHXII13:NUCLEI

364010 For a radioactive substance, fraction of its initial quantity \(\left(N_{0}\right)\) which will disintegrate in its average life time is about \((e=2.71)\)

1 \(\left(\dfrac{1}{3}\right) N_{0}\)
2 \(\left(\dfrac{2}{3}\right) N_{0}\)
3 \((0.9) N_{0}\)
4 \(\left(\dfrac{1}{2}\right) N_{0}\)
MHTCET - 2022
PHXII13:NUCLEI

364011 In one half-life time duration
I.
Activity of a sample reduced to half of its initial value.
II.
Number of radio active nuclei present is reduced to half of its initial value.
III.
Mass of sample is reduced to half of its initial value.
Out of these, correct statements are

1 I and III
2 I and II
3 I, II and III
4 II and III
PHXII13:NUCLEI

364012 If the half-life of any sample of radioactive susbtance is 4 days, then the fraction of sample will remain undecayed after 2 days, will be

1 \(\sqrt 2 \)
2 \(\frac{1}{{\sqrt 2 }}\)
3 \(\frac{{\sqrt 2 - 1}}{{\sqrt 2 }}\)
4 \(\frac{1}{2}\)
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PHXII13:NUCLEI

364008 When a radioactive substance is subjected to a vacuum, the rate of disintegration per second

1 increases considerably
2 is not affected
3 increases only if the products are gases
4 suffers a slight decrease
PHXII13:NUCLEI

364009 1 \(mg\) gold undergoes decay with 2.7 days half-life period, amount left after 8.1 days is

1 \(0.125\,mg\)
2 \(0.5\,mg\)
3 \(0.25\,mg\)
4 \(0.91\,mg\)
PHXII13:NUCLEI

364010 For a radioactive substance, fraction of its initial quantity \(\left(N_{0}\right)\) which will disintegrate in its average life time is about \((e=2.71)\)

1 \(\left(\dfrac{1}{3}\right) N_{0}\)
2 \(\left(\dfrac{2}{3}\right) N_{0}\)
3 \((0.9) N_{0}\)
4 \(\left(\dfrac{1}{2}\right) N_{0}\)
MHTCET - 2022
PHXII13:NUCLEI

364011 In one half-life time duration
I.
Activity of a sample reduced to half of its initial value.
II.
Number of radio active nuclei present is reduced to half of its initial value.
III.
Mass of sample is reduced to half of its initial value.
Out of these, correct statements are

1 I and III
2 I and II
3 I, II and III
4 II and III
PHXII13:NUCLEI

364012 If the half-life of any sample of radioactive susbtance is 4 days, then the fraction of sample will remain undecayed after 2 days, will be

1 \(\sqrt 2 \)
2 \(\frac{1}{{\sqrt 2 }}\)
3 \(\frac{{\sqrt 2 - 1}}{{\sqrt 2 }}\)
4 \(\frac{1}{2}\)
Join With Us for More Updates
PHXII13:NUCLEI

364008 When a radioactive substance is subjected to a vacuum, the rate of disintegration per second

1 increases considerably
2 is not affected
3 increases only if the products are gases
4 suffers a slight decrease
PHXII13:NUCLEI

364009 1 \(mg\) gold undergoes decay with 2.7 days half-life period, amount left after 8.1 days is

1 \(0.125\,mg\)
2 \(0.5\,mg\)
3 \(0.25\,mg\)
4 \(0.91\,mg\)
PHXII13:NUCLEI

364010 For a radioactive substance, fraction of its initial quantity \(\left(N_{0}\right)\) which will disintegrate in its average life time is about \((e=2.71)\)

1 \(\left(\dfrac{1}{3}\right) N_{0}\)
2 \(\left(\dfrac{2}{3}\right) N_{0}\)
3 \((0.9) N_{0}\)
4 \(\left(\dfrac{1}{2}\right) N_{0}\)
MHTCET - 2022
PHXII13:NUCLEI

364011 In one half-life time duration
I.
Activity of a sample reduced to half of its initial value.
II.
Number of radio active nuclei present is reduced to half of its initial value.
III.
Mass of sample is reduced to half of its initial value.
Out of these, correct statements are

1 I and III
2 I and II
3 I, II and III
4 II and III
PHXII13:NUCLEI

364012 If the half-life of any sample of radioactive susbtance is 4 days, then the fraction of sample will remain undecayed after 2 days, will be

1 \(\sqrt 2 \)
2 \(\frac{1}{{\sqrt 2 }}\)
3 \(\frac{{\sqrt 2 - 1}}{{\sqrt 2 }}\)
4 \(\frac{1}{2}\)