Radioactivity
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PHXII13:NUCLEI

364043 \(N\) atoms of a radioactive element emit \(n\) alpha particles per second. The half-life of the element is

1 \(\frac{N}{n}\sec \)
2 \(\frac{n}{N}\sec \)
3 \(\frac{{0.693n}}{N}\sec \)
4 \(\frac{{0.693N}}{n}\sec \)
PHXII13:NUCLEI

364044 A radioactive element has half life of 15 years. What is the fraction that will decay in 30 years?

1 \(0.75\)
2 \(0.85\)
3 \(0.25\)
4 \(0.5\)
PHXII13:NUCLEI

364045 A human body excretes certain material by a law similar to radioactivity. The body excretes half the amount injected in \(24h\). Find the time in which activity falls to \({\text{3}}\mu {\text{Ci}}\). If a person is injected technitium \(\left( {{t_{1/2}} = 6h} \right)\) and its activity just after the injection is \(6\mu {\text{Ci}}{\text{.}}\)

1 \({\text{6}}\,h\)
2 \(4.8\,h\)
3 \(6.3\,h\)
4 \(\operatorname{None} \,of these\)
PHXII13:NUCLEI

364046 The half-life period of radium is 1600 yr. The fraction of a sample of radium that would remain after 6400 yr is

1 \(\frac{1}{{16}}\)
2 \(\frac{1}{2}\)
3 \(\frac{1}{4}\)
4 \(\frac{1}{8}\)
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PHXII13:NUCLEI

364043 \(N\) atoms of a radioactive element emit \(n\) alpha particles per second. The half-life of the element is

1 \(\frac{N}{n}\sec \)
2 \(\frac{n}{N}\sec \)
3 \(\frac{{0.693n}}{N}\sec \)
4 \(\frac{{0.693N}}{n}\sec \)
PHXII13:NUCLEI

364044 A radioactive element has half life of 15 years. What is the fraction that will decay in 30 years?

1 \(0.75\)
2 \(0.85\)
3 \(0.25\)
4 \(0.5\)
PHXII13:NUCLEI

364045 A human body excretes certain material by a law similar to radioactivity. The body excretes half the amount injected in \(24h\). Find the time in which activity falls to \({\text{3}}\mu {\text{Ci}}\). If a person is injected technitium \(\left( {{t_{1/2}} = 6h} \right)\) and its activity just after the injection is \(6\mu {\text{Ci}}{\text{.}}\)

1 \({\text{6}}\,h\)
2 \(4.8\,h\)
3 \(6.3\,h\)
4 \(\operatorname{None} \,of these\)
PHXII13:NUCLEI

364046 The half-life period of radium is 1600 yr. The fraction of a sample of radium that would remain after 6400 yr is

1 \(\frac{1}{{16}}\)
2 \(\frac{1}{2}\)
3 \(\frac{1}{4}\)
4 \(\frac{1}{8}\)
NCERT Exemplar
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PHXII13:NUCLEI

364043 \(N\) atoms of a radioactive element emit \(n\) alpha particles per second. The half-life of the element is

1 \(\frac{N}{n}\sec \)
2 \(\frac{n}{N}\sec \)
3 \(\frac{{0.693n}}{N}\sec \)
4 \(\frac{{0.693N}}{n}\sec \)
PHXII13:NUCLEI

364044 A radioactive element has half life of 15 years. What is the fraction that will decay in 30 years?

1 \(0.75\)
2 \(0.85\)
3 \(0.25\)
4 \(0.5\)
PHXII13:NUCLEI

364045 A human body excretes certain material by a law similar to radioactivity. The body excretes half the amount injected in \(24h\). Find the time in which activity falls to \({\text{3}}\mu {\text{Ci}}\). If a person is injected technitium \(\left( {{t_{1/2}} = 6h} \right)\) and its activity just after the injection is \(6\mu {\text{Ci}}{\text{.}}\)

1 \({\text{6}}\,h\)
2 \(4.8\,h\)
3 \(6.3\,h\)
4 \(\operatorname{None} \,of these\)
PHXII13:NUCLEI

364046 The half-life period of radium is 1600 yr. The fraction of a sample of radium that would remain after 6400 yr is

1 \(\frac{1}{{16}}\)
2 \(\frac{1}{2}\)
3 \(\frac{1}{4}\)
4 \(\frac{1}{8}\)
NCERT Exemplar
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PHXII13:NUCLEI

364043 \(N\) atoms of a radioactive element emit \(n\) alpha particles per second. The half-life of the element is

1 \(\frac{N}{n}\sec \)
2 \(\frac{n}{N}\sec \)
3 \(\frac{{0.693n}}{N}\sec \)
4 \(\frac{{0.693N}}{n}\sec \)
PHXII13:NUCLEI

364044 A radioactive element has half life of 15 years. What is the fraction that will decay in 30 years?

1 \(0.75\)
2 \(0.85\)
3 \(0.25\)
4 \(0.5\)
PHXII13:NUCLEI

364045 A human body excretes certain material by a law similar to radioactivity. The body excretes half the amount injected in \(24h\). Find the time in which activity falls to \({\text{3}}\mu {\text{Ci}}\). If a person is injected technitium \(\left( {{t_{1/2}} = 6h} \right)\) and its activity just after the injection is \(6\mu {\text{Ci}}{\text{.}}\)

1 \({\text{6}}\,h\)
2 \(4.8\,h\)
3 \(6.3\,h\)
4 \(\operatorname{None} \,of these\)
PHXII13:NUCLEI

364046 The half-life period of radium is 1600 yr. The fraction of a sample of radium that would remain after 6400 yr is

1 \(\frac{1}{{16}}\)
2 \(\frac{1}{2}\)
3 \(\frac{1}{4}\)
4 \(\frac{1}{8}\)
NCERT Exemplar