147628
In the given nuclear reaction ${ }_{4}^{9} \mathrm{Be}+{ }_{2}^{4} \mathrm{He} \rightarrow{ }_{6}^{12} \mathrm{C}+\mathrm{X}$ $\mathrm{X}$ represents
1 Neutron
2 Proton
3 Positron
4 Electron
Explanation:
A On balancing atomic number and mass number on both side we get ${ }_{0}^{1} \mathrm{n}$ (neutron). So, the term $\mathrm{X}$ represents the neutron.
GUJCET 2017
NUCLEAR PHYSICS
147764
The phenomenon of radioactivity is :
1 exothermic change which increases or decreases with temperature
2 increases on applied pressure
3 nuclear process does not depend on external factors
4 none of the above
Explanation:
C Radioactivity is natural phenomenon in which particle are emitted from nuclei as a result of nuclear instability and does not depend upon external factors. Because the nucleus experiences the intense conflict between the two strongest forces in nature there are many nuclear isotopes which are unstable and emit some kind of radiation.
JIPMER-2005
NUCLEAR PHYSICS
147635
Activity of a radioactive substance becomes from $8000 \mathrm{~Bq}$ to $1000 \mathrm{~Bq}$ in 12 days. What is the half life of the radioactive substance?
1 4 days
2 6 days
3 2 days
4 3 days
Explanation:
A The value of initial sample is 8000 . It decays in 4 days to half of the initial value i.e. 4000 atoms. In next four days, it further decays to 2000] atoms in next four days, it will again decay to 1000 . $8000 \longrightarrow 4$ \ $4000 \underset{4}{\longrightarrow} 2000 \underset{4}{\longrightarrow} 1000$ So, half life of sample $\left(T_{1 / 2}\right)=4$ days
UPSEE - 2017
NUCLEAR PHYSICS
147637
The biological damage caused by 1 gray $\alpha$ radiation is compared with 1 gray $\gamma$-radiation in the same type of human tissue. The damage caused by the $\gamma$-radiation is
1 more serious as compared to the damage caused by the $\alpha$-radiation.
2 less serious as compared to the damage caused by the $\alpha$-radiation.
3 equally serious as the damage caused by the $\alpha$-radiation.
4 incomparable with the damage caused by the $\alpha$-radiation, because $\gamma$-radiation are not particles.
Explanation:
B $\alpha$-radiation is more dangerous than $\beta$ or $\gamma$ radiation if it is absorb by human tissue because its power to ionize, atoms is 20 times more $\beta$ and $\gamma$. So, the damage cause by $\gamma$-radiation is less serious as compared to damage caused by $\alpha$-radiation.
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NUCLEAR PHYSICS
147628
In the given nuclear reaction ${ }_{4}^{9} \mathrm{Be}+{ }_{2}^{4} \mathrm{He} \rightarrow{ }_{6}^{12} \mathrm{C}+\mathrm{X}$ $\mathrm{X}$ represents
1 Neutron
2 Proton
3 Positron
4 Electron
Explanation:
A On balancing atomic number and mass number on both side we get ${ }_{0}^{1} \mathrm{n}$ (neutron). So, the term $\mathrm{X}$ represents the neutron.
GUJCET 2017
NUCLEAR PHYSICS
147764
The phenomenon of radioactivity is :
1 exothermic change which increases or decreases with temperature
2 increases on applied pressure
3 nuclear process does not depend on external factors
4 none of the above
Explanation:
C Radioactivity is natural phenomenon in which particle are emitted from nuclei as a result of nuclear instability and does not depend upon external factors. Because the nucleus experiences the intense conflict between the two strongest forces in nature there are many nuclear isotopes which are unstable and emit some kind of radiation.
JIPMER-2005
NUCLEAR PHYSICS
147635
Activity of a radioactive substance becomes from $8000 \mathrm{~Bq}$ to $1000 \mathrm{~Bq}$ in 12 days. What is the half life of the radioactive substance?
1 4 days
2 6 days
3 2 days
4 3 days
Explanation:
A The value of initial sample is 8000 . It decays in 4 days to half of the initial value i.e. 4000 atoms. In next four days, it further decays to 2000] atoms in next four days, it will again decay to 1000 . $8000 \longrightarrow 4$ \ $4000 \underset{4}{\longrightarrow} 2000 \underset{4}{\longrightarrow} 1000$ So, half life of sample $\left(T_{1 / 2}\right)=4$ days
UPSEE - 2017
NUCLEAR PHYSICS
147637
The biological damage caused by 1 gray $\alpha$ radiation is compared with 1 gray $\gamma$-radiation in the same type of human tissue. The damage caused by the $\gamma$-radiation is
1 more serious as compared to the damage caused by the $\alpha$-radiation.
2 less serious as compared to the damage caused by the $\alpha$-radiation.
3 equally serious as the damage caused by the $\alpha$-radiation.
4 incomparable with the damage caused by the $\alpha$-radiation, because $\gamma$-radiation are not particles.
Explanation:
B $\alpha$-radiation is more dangerous than $\beta$ or $\gamma$ radiation if it is absorb by human tissue because its power to ionize, atoms is 20 times more $\beta$ and $\gamma$. So, the damage cause by $\gamma$-radiation is less serious as compared to damage caused by $\alpha$-radiation.
147628
In the given nuclear reaction ${ }_{4}^{9} \mathrm{Be}+{ }_{2}^{4} \mathrm{He} \rightarrow{ }_{6}^{12} \mathrm{C}+\mathrm{X}$ $\mathrm{X}$ represents
1 Neutron
2 Proton
3 Positron
4 Electron
Explanation:
A On balancing atomic number and mass number on both side we get ${ }_{0}^{1} \mathrm{n}$ (neutron). So, the term $\mathrm{X}$ represents the neutron.
GUJCET 2017
NUCLEAR PHYSICS
147764
The phenomenon of radioactivity is :
1 exothermic change which increases or decreases with temperature
2 increases on applied pressure
3 nuclear process does not depend on external factors
4 none of the above
Explanation:
C Radioactivity is natural phenomenon in which particle are emitted from nuclei as a result of nuclear instability and does not depend upon external factors. Because the nucleus experiences the intense conflict between the two strongest forces in nature there are many nuclear isotopes which are unstable and emit some kind of radiation.
JIPMER-2005
NUCLEAR PHYSICS
147635
Activity of a radioactive substance becomes from $8000 \mathrm{~Bq}$ to $1000 \mathrm{~Bq}$ in 12 days. What is the half life of the radioactive substance?
1 4 days
2 6 days
3 2 days
4 3 days
Explanation:
A The value of initial sample is 8000 . It decays in 4 days to half of the initial value i.e. 4000 atoms. In next four days, it further decays to 2000] atoms in next four days, it will again decay to 1000 . $8000 \longrightarrow 4$ \ $4000 \underset{4}{\longrightarrow} 2000 \underset{4}{\longrightarrow} 1000$ So, half life of sample $\left(T_{1 / 2}\right)=4$ days
UPSEE - 2017
NUCLEAR PHYSICS
147637
The biological damage caused by 1 gray $\alpha$ radiation is compared with 1 gray $\gamma$-radiation in the same type of human tissue. The damage caused by the $\gamma$-radiation is
1 more serious as compared to the damage caused by the $\alpha$-radiation.
2 less serious as compared to the damage caused by the $\alpha$-radiation.
3 equally serious as the damage caused by the $\alpha$-radiation.
4 incomparable with the damage caused by the $\alpha$-radiation, because $\gamma$-radiation are not particles.
Explanation:
B $\alpha$-radiation is more dangerous than $\beta$ or $\gamma$ radiation if it is absorb by human tissue because its power to ionize, atoms is 20 times more $\beta$ and $\gamma$. So, the damage cause by $\gamma$-radiation is less serious as compared to damage caused by $\alpha$-radiation.
147628
In the given nuclear reaction ${ }_{4}^{9} \mathrm{Be}+{ }_{2}^{4} \mathrm{He} \rightarrow{ }_{6}^{12} \mathrm{C}+\mathrm{X}$ $\mathrm{X}$ represents
1 Neutron
2 Proton
3 Positron
4 Electron
Explanation:
A On balancing atomic number and mass number on both side we get ${ }_{0}^{1} \mathrm{n}$ (neutron). So, the term $\mathrm{X}$ represents the neutron.
GUJCET 2017
NUCLEAR PHYSICS
147764
The phenomenon of radioactivity is :
1 exothermic change which increases or decreases with temperature
2 increases on applied pressure
3 nuclear process does not depend on external factors
4 none of the above
Explanation:
C Radioactivity is natural phenomenon in which particle are emitted from nuclei as a result of nuclear instability and does not depend upon external factors. Because the nucleus experiences the intense conflict between the two strongest forces in nature there are many nuclear isotopes which are unstable and emit some kind of radiation.
JIPMER-2005
NUCLEAR PHYSICS
147635
Activity of a radioactive substance becomes from $8000 \mathrm{~Bq}$ to $1000 \mathrm{~Bq}$ in 12 days. What is the half life of the radioactive substance?
1 4 days
2 6 days
3 2 days
4 3 days
Explanation:
A The value of initial sample is 8000 . It decays in 4 days to half of the initial value i.e. 4000 atoms. In next four days, it further decays to 2000] atoms in next four days, it will again decay to 1000 . $8000 \longrightarrow 4$ \ $4000 \underset{4}{\longrightarrow} 2000 \underset{4}{\longrightarrow} 1000$ So, half life of sample $\left(T_{1 / 2}\right)=4$ days
UPSEE - 2017
NUCLEAR PHYSICS
147637
The biological damage caused by 1 gray $\alpha$ radiation is compared with 1 gray $\gamma$-radiation in the same type of human tissue. The damage caused by the $\gamma$-radiation is
1 more serious as compared to the damage caused by the $\alpha$-radiation.
2 less serious as compared to the damage caused by the $\alpha$-radiation.
3 equally serious as the damage caused by the $\alpha$-radiation.
4 incomparable with the damage caused by the $\alpha$-radiation, because $\gamma$-radiation are not particles.
Explanation:
B $\alpha$-radiation is more dangerous than $\beta$ or $\gamma$ radiation if it is absorb by human tissue because its power to ionize, atoms is 20 times more $\beta$ and $\gamma$. So, the damage cause by $\gamma$-radiation is less serious as compared to damage caused by $\alpha$-radiation.