Solid State Physics Answers

Show that the probability that an energy level which is at an energy ∆E above the
Fermi level is occupied is equal to the probability that an energy level ∆E below the
Fermi level is not occupied.

At what angle will a diffracted beam emerge from the (111) planes of a face centered
cubic crystal of unit cell length 0.5 nm? Assume diffraction occurs in the first order
and that the x-ray wavelength is 0.3 nm?

how crystal defects influences its mechanical, electrical and optical behaviour

John drove south 120km at 60km/h and then east 150km at 50km/h.
Determine:
a. the average speed for the whole journey
b.the magnitude of the average velocity for the whole journey

Silver has FCC structure and its atomic radius is 1.414 amstrong. Find the volume of the unit cell?

Using the expression of Bose-Einstein distribution function for photons
1
1
−
=
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N
derive Plancks Law and show that (i) Rayleigh-Jeans Law, and (ii) Wien’s Law
follow from it at low & high frequencies

"A spanner was used to undo a nut. A force of 20 newtons was applied at a distance of 20 centimeters from the nut.calculate the moment of the force being used to undo the nut?"

three solid objects are floating in a liquid, as in the drawing. they have different weights and volumes, but have the same thickness ( the dimension perpendicular to the page ). rank the objects according to their density, largest first. b) which principle of physics regarding fluid pressure explains your answer? explain.

image from custom entry tool

Determine the number of normal modes in a linear monoatomic chain of 10 atoms?

Two trucks are travelling along a straight line with the leading truck travelling at 20 km/hr and the following truck travelling at 30 km/hr.
If the leading truck has a mass of 10 tonnes and the velocity of the two trucks after Impact is 26 km/hr find the mass of the second truck.