Main 10 · Advanced 13
Mass defect and binding energy
- Main 2026PhysicsSingle correct
The binding energy per nucleon of is ________ MeV.
[Take u, u, u, 1 u = 931 MeV/c²] - Main 2026PhysicsSingle correct
Two nuclei of mass number 3 combine with another nucleus of mass number 4 to yield a nucleus of mass number 10. If the binding energy per nucleon for the mass numbers 3, 4 and 10 are 5.6 MeV, 7.4 MeV and 6.1 MeV, respectively, then in the process, = ________ MeV.
- Main 2026PhysicsSingle correct
Assuming the experimental mass of as 12 u, the mass defect of atom is ________ MeV/c².
(Mass of proton = 1.00727 u, mass of neutron = 1.00866 u, 1 u = 931.5 MeV/c² and c is the speed of the light in vacuum).
- Main 2026PhysicsInteger
The energy released when kg of is converted into by proton bombardment is eV. The value of is ________. (Nearest integer)
(Mass of = 7.0183 u, mass of = 4.004 u, mass of proton = 1.008 u and 1 u = 931 MeV/c² and Avogadro number = )
- Main 2026PhysicsSingle correct
The energy released if hydrogen atoms are combined to form is ________ MeV.
(Take binding energies per nucleon of and as 1.1 MeV and 7.2 MeV, respectively)
- Advanced 2025PhysicsList match
List-I shows various functional dependencies of energy () on the atomic number (). Energies associated with certain phenomena are given in List-II.
Choose the option that describes the correct match between the entries in List-I to those in List-II.
- Advanced 2022PhysicsNumerical
The minimum kinetic energy needed by an alpha particle to cause the nuclear reaction in a laboratory frame is (in MeV). Assume that is at rest in the laboratory frame. The masses of , , and can be taken to be 16.006 , 4.003 , 1.008 and 19.003 , respectively, where . The value of is _____.
- Advanced 2022PhysicsMultiple correct
The binding energy of nucleons in a nucleus can be affected by the pairwise Coulomb repulsion. Assume that all nucleons are uniformly distributed inside the nucleus. Let the binding energy of a proton be and the binding energy of a neutron be in the nucleus.
Which of the following statement(s) is(are) correct?
- Main 2022PhysicsSingle correct
Nucleus A is having mass number 220 and its binding energy per nucleon is 5.6 MeV. It splits in two fragments 'B' and 'C' of mass numbers 105 and 115. The binding energy of nucleons in 'B' and 'C' is 6.4 MeV per nucleon. The energy Q released per fission will be :
- Main 2022PhysicsSingle correct
The Q-value of a nuclear reaction and kinetic energy of the projectile particle, are related as :
- Main 2022PhysicsInteger
Two lighter nuclei combine to form a comparatively heavier nucleus by the relation given below :
The binding energies per nucleon for and are 1.1 MeV and 7.6 MeV respectively. The energy released in this process is ______ MeV.
- Advanced 2021PhysicsMultiple correct
A heavy nucleus , at rest, undergoes fission , where and are two lighter nuclei. Let , where , and are the masses of , and , respectively. and are the kinetic energies of and , respectively. The speeds of and are and , respectively. If is the speed of light, which of the following statement(s) is(are) correct?
- Advanced 2019PhysicsNumerical
Suppose a nucleus at rest and in ground state undergoes α-decay to a nucleus in its excited state. The kinetic energy of the emitted α particle is found to be 4.44 MeV. nucleus then goes to its ground state by γ-decay. The energy of the emitted γ photon is ______ keV.
[Given: atomic mass of = 226.005 u, atomic mass of = 222.000 u, atomic mass of α particle = 4.000 u, 1 u = 931 MeV/c², c is speed of the light]
- Main 2017PhysicsSingle correct
Two deuterons undergo nuclear fusion to form a Helium nucleus. Energy released in this process is : (given binding energy per nucleon for deuteron = 1.1 MeV and for helium = 7.0 MeV)
- Main 2017PhysicsSingle correct
Imagine that a reactor converts all given mass into energy and that it operates at a power level of watt. The mass of the fuel consumed per hour in the reactor will be : (velocity of light, c is m/s)
- Advanced 2016PhysicsInteger
The isotope having a mass 12.014 u undergoes β-decay to . has an excited state of the nucleus at 4.041 MeV above its ground state. If decays to , the maximum kinetic energy of the β-particle in units of MeV is (, where is the speed of light in vacuum).
- Advanced 2016PhysicsSingle correct
The electrostatic energy of protons uniformly distributed throughout a spherical nucleus of radius is given by
The measured masses of the neutron, , and are 1.008665 u, 1.007825 u, 15.000109 u and 15.003065 u, respectively. Given that the radii of both the and nuclei are same, ( is the speed of light) and MeV fm. Assuming that the difference between the binding energies of and is purely due to the electrostatic energy, the radius of either of the nuclei is( m)
- Advanced 2015PhysicsMultiple correct
A fission reaction is given by , where and are two particles. Considering to be at rest, the kinetic energies of the products are denoted by , , (2 MeV) and (2 MeV), respectively. Let the binding energies per nucleon of , and be 7.5 MeV, 8.5 MeV and 8.5 MeV, respectively. Considering different conservation laws, the correct option(s) is(are)
- Advanced 2013PhysicsSingle correct
The correct statement is
- Advanced 2013PhysicsSingle correct
The kinetic energy (in keV) of the alpha particle, when the nucleus at rest undergoes alpha decay, is