Why are the metals opaque to visible light and transparent to x-rays and gamma rays?
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The enthalpy of vacancy formation in nickel is , and its melting point is
. What is the equilibrium vacancy concentration in nickel at
?
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?
How do the interactions between the substrate and adsorbate atoms determine the growth mode of thin films? Describe the various modes of thin film growth.
What is luminescence of a material? Differentiate between fluorescence and phosphorescence.
Describe the various methods of creating point defects. Discuss the constructive (positive) effect of dislocations in materials.
With the help of appropriate diagrams describe the possible ways of accommodating the added alloying elements into a pure metal lattice for the following cases:
i) Limited solubility
ii) Good solubility.
In the inclined crystal plane arrange the following sites in the order of increasing possibility of crystal growth site: terraces, kinks, ledges.