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Fusion reaction takes place at a higher temperature because:
1.
atoms get ionized at high temperatures.
2.
kinetic energy is high enough to overcome the Coulomb repulsion between nuclei.
3.
molecules break up at a high temperature.
4.
nuclei break up at a high temperature.
Subtopic: Nuclear Energy |
83%
Level 1: 80%+
NEET - 2011
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Which of the following pairs of nuclei are isotones?
| 1. | \({}_{34}^{74}\mathrm{Se}, {}_{31}^{71}\mathrm{Ca}\) | 2. | \({}_{42}^{92}\mathrm{Mo}, {}_{40}^{92}\mathrm{Zr}\) |
| 3. | \({}_{38}^{81}\mathrm{Sr}, {}_{38}^{86}\mathrm{Sr}\) | 4. | \({}_{20}^{40}\mathrm{Ca}, {}_{16}^{32}\mathrm{S}\) |
Subtopic: Nuclear Binding Energy |
86%
Level 1: 80%+
Hints
Two nuclei fuse together to form a single nucleus as \({}_{1}^{2}\mathrm{A}+ {}_{1}^{2}\mathrm{A}\rightarrow{}_{2}^{4}\mathrm{B}\) If binding energy per nucleon of \(A\) and \(B\) are respectively \(x\) and \(y\), then the energy released in the process is:
| 1. | \(4x+4y\) | 2. | \(4x-4y\) |
| 3. | \(4y-4x\) | 4. | \(y-x\) |
Subtopic: Nuclear Binding Energy |
75%
Level 2: 60%+
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The nucleus \({ }_{6}^{12} \mathrm{C}\) absorbs an energetic neutron and emits \(\beta\text-\)particle. The resulting nucleus is:
| 1. | \({ }_{7}^{14} \mathrm{N}\) | 2. | \({ }_{5}^{13} \mathrm{B}\) |
| 3. | \({ }_{7}^{13} \mathrm{N}\) | 4. | \({ }_{6}^{13} \mathrm{C}\) |
Subtopic: Types of Decay |
66%
Level 2: 60%+
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If a proton and anti-proton come close to each other and annihilate, how much energy will be released?
| 1. | \(1.5 \times10^{-10}~\text{J}\) | 2. | \(3 \times10^{-10}~\text{J}\) |
| 3. | \(4.5 \times10^{-10}~\text{J}\) | 4. | None of these |
Subtopic: Mass-Energy Equivalent |
56%
Level 3: 35%-60%
Hints
What is the respective number of \(\alpha\) and \(\beta\text-\) particles emitted in the following radioactive decay?
\({}_{90}^{200}\mathrm{X}\rightarrow {}_{80}^{168}\mathrm{Y}\)
\({}_{90}^{200}\mathrm{X}\rightarrow {}_{80}^{168}\mathrm{Y}\)
| 1. | \(6\) and \(8\) | 2. | \(6\) and \(6\) |
| 3. | \(8\) and \(8\) | 4. | \(8\) and \(6\) |
Subtopic: Types of Decay |
85%
Level 1: 80%+
Hints
If the nuclear density of the material of atomic mass \(27\) is \(3\rho _{0},\) then the nuclear density of the material of atomic mass \(125\) is:
1. \(5\rho_0\)
2. \(3\rho_0\)
3. \(\frac{5}{3}\rho_0\)
4. \(\rho_0\)
1. \(5\rho_0\)
2. \(3\rho_0\)
3. \(\frac{5}{3}\rho_0\)
4. \(\rho_0\)
Subtopic: Nucleus |
73%
Level 2: 60%+
Hints
\({}_{8}^{19}\mathrm{O}\rightarrow {}_{9}^{19}\mathrm{F}+\mathrm{A}+\mathrm{B}\)
In the given decay equation, \(\mathrm{A}\) and \(\mathrm{B}\) indicate:
In the given decay equation, \(\mathrm{A}\) and \(\mathrm{B}\) indicate:
| 1. | Electron and antineutrino |
| 2. | Positron and antineutrino |
| 3. | Positron and neutrino |
| 4. | Electron and positron |
Subtopic: Types of Decay |
68%
Level 2: 60%+
Hints
After two alpha decays and four beta(-ve) decays, the atomic number:
| 1. | decreases by \(4\) and the mass number remains the same. |
| 2. | remains the same but the mass number increases by \(4.\) |
| 3. | remains the same but the mass number decreases by \(8.\) |
| 4. | increases but the mass number remains the same. |
Subtopic: Types of Decay |
85%
Level 1: 80%+
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Binding energy per nucleon of a fixed nucleus \({}^{A}\mathrm{X}\) is \(8\) MeV. It absorbs a neutron moving with kinetic energy \(4\) MeV and converts into \(Y\) emitting a photon of energy \(2\) MeV. The binding energy per nucleon of \(Y\) (in MeV) is:
| 1. | \(\dfrac{8 A + 2}{A + 1}\) | 2. | \(\dfrac{8 A - 2}{A + 1}\) |
| 3. | \(\dfrac{8 A - 1}{A + 1}\) | 4. | \(\dfrac{8 A}{A + 1}\) |
Subtopic: Nuclear Binding Energy |
55%
Level 3: 35%-60%
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