A nucleus represented by the symbol has:
1. | Z protons and A –Z neutrons |
2. | Z protons and A neutrons |
3. | A protons and Z –A neutrons |
4. | Z neutrons and A –Z protons |
Which of the following pairs of nuclei are isotones?
1.
2.
3.
4.
The binding energy of deuteron is 2.2 MeV and that of is 28 MeV. If two deuterons are fused to form one then the energy released is:
1. | 25.8 MeV | 2. | 23.6 MeV |
3. | 19.2 MeV | 4. | 30.2 MeV |
1. | decrease continuously with mass number. |
2. | first decreases and then increases with an increase in mass number. |
3. | first increases and then decreases with an increase in mass number. |
4. | increases continuously with mass number. |
If in a nuclear fusion process. the masses of the fusing nuclei be \(m_1\) and \(m_2\) and the mass of the resultant nucleus be \(m_3,\) then:
1. | \( m_3=\left|m_1-m_2 \right|\) | 2. | \( m_3<\left ( m_1+m_2 \right ) \) |
3. | \( m_3>\left ( m_1+m_2 \right ) \) | 4. | \( m_3=\left ( m_1+m_2 \right ) \) |
The binding energy per nucleon of deuterium and helium atom is 1.1 MeV and 7.0 MeV. If two deuterium nuclei fuse to form a helium atom, the energy released is:
1. 19.2 MeV
2. 23.6 MeV
3. 26.9 MeV
4. 13.9 MeV
In a fission reaction,
\(^{236}_{92}U\rightarrow ~^{117}X~+~^{117}Y~+~^1_0n~+~^1_0n,\) the binding energy per nucleon of X and Y is 8.5 MeV whereas that of \(^{236}U\) is 7.6 MeV. The total energy liberated will be about:
1. 2000 MeV
2. 200 MeV
3. 2 MeV
4. 1 keV
The mass of a proton is 1.0073 u and that of a neutron is 1.0087 u (u = atomic mass unit). The binding energy of is: (Given: helium nucleus mass ≈ 4.0015 u)
1. | 0.0305 J | 2. | 0.0305 erg |
3. | 28.4 MeV | 4. | 0.061 u |
If M (A, Z), , and denote the masses of the nucleus , proton, and neutron respectively in units of u (1 u = 931.5 MeV/c2) and BE represents its binding energy in MeV, then:
1. | \(M(A, Z)=Z_p+(A-Z) M_n-B E / c^2\) |
2. | \(\mathrm{M}(\mathrm{A}, \mathrm{Z})=\mathrm{ZM}_{\mathrm{p}}+(\mathrm{A}-\mathrm{Z}) \mathrm{M}_{\mathrm{n}}+\mathrm{BE}\) |
3. | \(M(A, Z)=Z_p+(A-Z) M_n-B E\) |
4. | \(\mathrm{M}(\mathrm{A}, \mathrm{Z})=\mathrm{ZM}_{\mathrm{p}}+(\mathrm{A}-\mathrm{Z}) \mathrm{M}_{\mathrm{n}}+\mathrm{BE} / \mathrm{c}^2\) |
In the reaction
,
if the binding energies of are respectively a, b, and c (in MeV), then the energy in (MeV) released in this reaction is:
1. c + a - b
2. c - a - b
3. a + b + c
4. a + b - c