Check if isospin is conserved in the following reactions:
See Answer →What are Fullerenes? Describe any two applications of Fullerenes.
See Answer →Differentiate between ferromagnetism, antiferromagnetism and ferrimagnetism with examples. State the physical significance of magnetic anisotropy.
See Answer →What is luminescence of a material? Differentiate between fluorescence and phosphorescence.
See Answer →Why are the metals opaque to visible light and transparent to x-rays and gamma rays?
See Answer → Define Q-value of a nuclear reaction. Calculate the Q-value of the reaction: . Given:
Whether the reaction is exoergic or endoergic?
See Answer →
Describe the method of performing Vicker’s hardness test with appropriate diagram.
See Answer →Explain the Austenite to Martensite diffusionless transformation with example.
See Answer → A thin target of
thickness is bombarded with a proton beam resulting in
. Calculate the reaction cross-section
for this nuclear reaction.
Given: Density of
Differentiate between Avrami and Johnson-Mehl models of phase transformations.
See Answer →Explain the phenomenon of nuclear fission. What is the importance of chain reactor in nuclear fission? Explain briefly the principle of operation of a nuclear reactor.
See Answer →A reactor operating at a power level of uses thermal neutrons producing fissions of
. If the thermal flux is
, calculate the mass of
present in the reactor? Assume
.
Explain Lever rule with appropriate diagram.
See Answer →The enthalpy of vacancy formation in nickel is , and its melting point is
. What is the equilibrium vacancy concentration in nickel at
?
What is reciprocity theorem of nuclear reactions? Obtain its mathematical expression. Rewrite the reciprocity theorem considering the spin of all the involved nuclei.
See Answer →Explain Fick’s diffusion laws.
See Answer →Calculate the energy produced (in Joules) by fission of of
.
Given: The energy released per fission of is
.
Obtain an expression of momentum distribution of -particles in the momentum range
to
, considering the Coulomb correction term. Also, derive the energy distribution function to get the shape of the
-decay spectrum.
What is F centre defect? Why is there a characteristic absorption energy associated with the F centre? If the F centre absorption energy for CsCl is 2.0 eV, what is its characteristic absorption wavelength?
See Answer →-decay process with one example