A nucleus with mass number 220 initially at rest emits an -particle. If the Q value of the reaction is 5.5 MeV, then the kinetic energy of -particle is:
1. 4.4 meV
2. 5.4 MeV
3. 5.6 MeV
4. 6.5 MeV
If the density of gold nucleus is X, then the density of silver nucleus will be:
1. 2X
2.
3. 4X
4. X
The volume (V) of a nucleus is related to its mass (M) as:
1.
2.
3.
4.
The statement which is incorrect about nuclear force between two protons is?
1. | These are always attractive forces. |
2. | These are non-central forces. |
3. | These are charge independent. |
4. | These are short-range forces. |
Binding energy per nucleon of a fixed nucleus A 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.
2.
3.
4.
After two alpha decays and four beta(-ve) decays, the atomic number:
1. | Decreases by 4 and mass number remains same. |
2. | Remains the same but the mass number increases by 4. |
3. | Remains the same but mass number decreases by 8. |
4. | Increases but mass number remains same. |
In the given decay equation, A and B indicate:
1. | Electron and antineutrino |
2. | Positron and antineutrino |
3. | Positron and neutrino |
4. | Electron and positron |
If the nuclear density of the material of atomic mass 27 is \(3\rho _{0},\)hen the nuclear density of the material of atomic mass 125 is:
1. 5
2. 3
3.
4.
The binding energies of the nuclei A and B are Ea and Eb respectively. If three atoms of the element B fuse to give one atom of element A and an energy Q is released, then Ea, Eb and Q are related as:
1. Ea – 3Eb = Q
2. 3Eb – Ea = Q
3. Ea + 3Eb = Q
4. Eb + 3Ea = Q
A certain mass of Hydrogen is changed to Helium by the process of fusion. The mass defect in the fusion reaction is 0.02866 u. The energy liberated per nucleon is: (Given 1 u = 931 MeV)
1. | 26.7 MeV | 2. | 6.675 MeV |
3. | 13.35 MeV | 4. | 2.67 MeV |