What are the four fundamental forces in nature? List the field particles that mediate these interactions and their properties. Which of the fundamental forces (interactions) are responsible for the neutrino flux from the sun and the neutrinos produced in the reactors?
See Answer →List the quantum numbers associated with leptons. State whether they are conserved in strong, weak and electromagnetic interactions. Hence explain whether the following reactions are allowed
:
b) Show thats a weak interaction decay whereas
electromagnetic decay.
See Answer →A compound nucleus has a neutron resonance at 75 eV which is produced through a neutron entrance channel. The resonance state mainly decays through a neutron, gamma and alpha channel with the partial decay widths as
, respectively. Estimate the cross section for
reactions.
Write the Bethe-Weiszacker mass formula. Explain the various terms involved in it. Draw curves, between binding energy per nucleon versus mass number, which represents contribution of various terms in the semi-empirical mass formula of binding energy per nucleon.
c) (i) The experimentally observed magnetic dipole moment of deuteron is
On the basis of observed dipole moment, what are the possible
spin configurations in which neutron and proton can exist in deuteron
(ii) Justify the possible reasons for the deviation in the observed and expected
value of magnetic dipole moment of deuteron.
Given:
Tritium emits electrons and magnesium emits positrons. Represent the
two decay processes by equations and calculate in each case the end-point energy of the particles emitted.
Given:
i)Why do we need to cool the Co 60 sample in Wu’s experiment?
ii) Prove that the law of conservation of angular momentum is not violated in
decay if the intrinsic spin of neutrino is
Using the nuclear shell model, obtain the magnetic moment and electric
quadrupole moment of the ground state of Sc nuclei.
Given :
A nucleus has energy levels at 0.025, 0.082, 0.160, 0.326 and1.415MeV. Which of these energies are expected to be the energy of members
of the rotational band if the ground state of
On the basis of semi-empirical mass formula, explain as why there are two mass parabola for even-A nuclei and only one for A-odd nuclei.
See Answer →Using the effective range formula, evaluate the total n-p scattering cross-section for a neutron interacting with a free proton in a laboratory at 10MeV.
Given: scattering lengths:
Effective range:
Explain tensor potential which justifies the non – zero quadrupole moment of deuteron.
See Answer →Consider a square well potentialObtain wavefunction of deuteron within the range of potential and outside.
A human body contains 0.245kg of normal potassium (K) of which 0.015 percent isthe radioactive beta emitter potassium-40 Calculate therate of production of
-particles in the body from the decay of potassium-40. What is the activity?
Human Resource value
See Answer →Objective and importance of Task analysis
See Answer →Competencies for HRD staff
See Answer →Emerging Trends in HRD
See Answer →Explain the various methods of job evaluation. Which method, according to you, is more suitable for tourism industry and why?
See Answer →Explain the concept of Human Resource Accounting and the major factors which influence the choice of a Human Resource Accounting System?
See Answer →Develop a comprehensive human resource plan for a new tourism business including recruitment, selection, training and development strategies
See Answer →