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Q. What is the density of energy states in metals? Obtain an expression for the density of states for free electron gas in metals.
Ans. Density of energy state is defined as the number of available energy states per unit energy range per unit volume.
To calculate density of energy state, let us introduce a 3 D space defined by. Each point in this space would represent an energy state and is associated with a volume element of one unity. Now if we draw a sphere of radius n in this space then each energy state defined by
The factor 1/8 accounts for the fact that only positive integers are allowable and thus only one octant of the sphere is available.
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A 2350-kg granite tombstone absorbs 2.8 x 107 J of energy from the Sun to change its temperature from 5.0°C at night to 20.0°C during an autumn day.
Introduction : A country gets specialisation in a specific commodity due to diversification of economic resources. This stimulates a country to go for international trade. Inte
A 30-g car rolls from a hill 12 cm high and is traveling at 154 cm/s as it travels along a 275 cm horizontal track. What is the momentum of the car?
a) Sketch the small-signal equivalent circuit for a field-effect transistor (FET) and explain how it can be deduced from the properties of the real device. b) Draw the circuit
if CPH has mass, so CPH Theory is able explain the universe future. Universe should collapse. And it is able explain dark matter too. Am I wrong? Answer; you are correct that C
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A boy throws a ball vertically upward with a velocity of 6 meters per second. How long does it take the ball to return to the boy's hand? Ans: A boy throws a ball vertically
Capacitor have thin conducting plates (usually made of metal) separated by a layer of dielectric, then stacked or rolled to form a compact device. Many types of capacitors are avai
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