Describe the method of performing Vicker’s hardness test with appropriate diagram.
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Explain the working of organic LED.
Describe the various methods of creating point defects. Discuss the constructive (positive) effect of dislocations in materials.
Write the symmetries associated with the following 2-D defects:
i) Grain Boundary
ii) Twin Boundary
iii) Stacking Fault
Given that the density of molten Ge is 5.60 g cm⁻³ calculate the amount of boron required to obtain 10 kg p-type Ge with dopant concentration of 10¹⁷ cm⁻³. Take density of boron = 2.34 g cm⁻³, atomic weight of boron = 10.811 and k₀ = 0.8.
Common types of engineering materials are metals, ceramics, polymers and composites. Compare these four classes on the basis of their composition and any two properties. State one application of each type.
Explain the Austenite to Martensite diffusionless transformation with example.
The enthalpy of vacancy formation in nickel is , and its melting point is
. What is the equilibrium vacancy concentration in nickel at
?