MEDIUM
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Assertion: Energy is released when heavy nuclei undergo fission or light nuclei undergo fusion.

Reason: For heavy nuclei, binding energy per nucleon increases with increasing Z while for light nuclei it decreases with increasing Z.

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Important Questions on Nuclei

EASY
Physics>Modern Physics>Nuclei>Mass-energy and Nuclear Binding Energy
The energy required to break one bond in DNA is 10–20 J. This value in eV is nearly
MEDIUM
Physics>Modern Physics>Nuclei>Mass-energy and Nuclear Binding Energy
Find the Binding energy per nucleon for Sn50120. Mass of proton mp=1.00783 u, mass of neutron mn=1.00867 u and mass of tin nucleus mSn=119.902199 u. (take 1 u=931 MeV)
MEDIUM
Physics>Modern Physics>Nuclei>Mass-energy and Nuclear Binding Energy
The energy equivalent of 0.5 g of a substance is:
EASY
Physics>Modern Physics>Nuclei>Mass-energy and Nuclear Binding Energy
If the binding energy of N14 is 7.5 MeV per nucleon and that of N15 is 7.7 MeV per nucleon, then the energy required to remove a neutron from N15 is
HARD
Physics>Modern Physics>Nuclei>Mass-energy and Nuclear Binding Energy
Consider the nuclear fission, Ne20→2He4+C12. Given that the binding energy/nucleon of Ne20, He4 and C12 are 8.03 MeV, 7.86 MeV, respectively. Identify the correct statement:
MEDIUM
Physics>Modern Physics>Nuclei>Mass-energy and Nuclear Binding Energy
In a process, certain amount of mass gets converted into energy. Let all the energy so converted be in the form of photons. If 700×1012 Hz is the mean frequency of the photons and if there are approximately 1030 photons, what is the approximate mass that is converted into photons? (Assume h=6.6×10-34 J s, c=3×108 m s-1)
EASY
Physics>Modern Physics>Nuclei>Mass-energy and Nuclear Binding Energy
You are given that  Mass of Li37=7.0160u, Mass of He24=4.0026u and Mass of  He11=1.0079u. When 20g of Li37 is converted into 24He by proton capture, the energy liberated, (in kWh ), is: [Mass of nucleon =1GeV/c2]
MEDIUM
Physics>Modern Physics>Nuclei>Mass-energy and Nuclear Binding Energy

The energy equivalent to a substance of mass 1 g is

HARD
Physics>Modern Physics>Nuclei>Mass-energy and Nuclear Binding Energy
The electrostatic energy of Z protons uniformly distributed throughout a spherical nucleus of radius R is given by, E=35ZZ-1e24πε0R. The measured masses of the neutron, H11, N715 and O815 are 1.008665 u, 1.007825 u, 15.000109 u and 15.003065 u respectively. Given that the radii of both the N715 and O815 nuclei are same, 1 u=931.5 MeV c-2 (c is the speed of light) and e24πϵ0=1.44 MeV fm. Assuming that the difference between the binding energies of N715 and O815 is purely due to the electrostatic energy, the radius of either of the nuclei is 1 fm=10-15m
EASY
Physics>Modern Physics>Nuclei>Mass-energy and Nuclear Binding Energy
The binding energy per nucleon of  5B10 is 8.0 MeV and that of  5B11 is 7.5 MeV. The Energy required to remove a neutron from  5B11 is (mass of electron and proton are 9.11×10-31 kg and 1.67×10-27 kg)
MEDIUM
Physics>Modern Physics>Nuclei>Mass-energy and Nuclear Binding Energy
A nucleus X emits a β -particle to produce a nucleus Y. If their atomic masses are Mx and My respectively, then the maximum energy of the β -particle emitted is (where, me is the mass of an electron and c is the velocity of light)
MEDIUM
Physics>Modern Physics>Nuclei>Mass-energy and Nuclear Binding Energy
Two deuterons undergo nuclear fusion to form a Helium nucleus. The energy released in this process is (given binding energy per nucleon for deuteron=1.1 MeV and for helium=7.0 MeV)
EASY
Physics>Modern Physics>Nuclei>Mass-energy and Nuclear Binding Energy
The mass-defect in a nuclear fusion reaction is 0.3 per cent. The amount of energy released in one kg of fusion reaction is
EASY
Physics>Modern Physics>Nuclei>Mass-energy and Nuclear Binding Energy

What is the binding energy of S1429i whose atomic mass is 28.976495 u

Mass of proton =1.007276 u

Mass of neutron =1.008664 u

(Neglect the electron mass) (Assume 1 u=931.5 MeV)

EASY
Physics>Modern Physics>Nuclei>Mass-energy and Nuclear Binding Energy
In a certain mass spectrometer, an ion beam passes through a velocity filter consisting of mutually perpendicular fields E and B. The beam then enters a region of another magnetic field B', perpendicular to the beam. The radius of curvature of the resulting ion beam is proportional to
MEDIUM
Physics>Modern Physics>Nuclei>Mass-energy and Nuclear Binding Energy
Find the energy equivalent of one atomic mass unit in Joules and in MeV.
EASY
Physics>Modern Physics>Nuclei>Mass-energy and Nuclear Binding Energy
The binding energy of a nucleus is equivalent to
EASY
Physics>Modern Physics>Nuclei>Mass-energy and Nuclear Binding Energy
If the binding energy of the electron in a hydrogen atom is 13.6 eV, the energy required to remove the electron from the first excited state of Li++ is :
EASY
Physics>Modern Physics>Nuclei>Mass-energy and Nuclear Binding Energy
Imagine that a reactor converts all the given mass into energy and that it operates at a power level of 109 Watt . The mass of the fuel consumed per hour, in the reactor, will be:
(velocity of light, c is 3×108 m s-1)
EASY
Physics>Modern Physics>Nuclei>Mass-energy and Nuclear Binding Energy
A particle of rest mass m0 is travelling, so that its total energy is twice its rest mass energy. It collides with another stationary particle of rest mass m0 to form a new particle. What is the rest mass of the new particle?