Solid State Physics Answers

Question 4

4.1. ​The conductivity of silver is 6.5 x 107per Ohm per m and number of conduction electrons per m3 is 6 x 1028. Find the mobility of conduction electrons and the drift velocity in an electric field of 1 V/m. Given m = 9.1 x 10–31 kg and e = 1.602 x 10–19 C.​​​​​​

4.2​ What is Lorentz number? The thermal and electrical conductivities of Cu at 200C are 390 Wm-1K-1 and 5.87 x107W-1m-1 respectively. Calculate Lorentz number.​​  

5.1​ The electron and hole mobilities in a Si sample are 0.135 and 0.48m2/V-s respectively. ​Determine the conductivities of intrinsic Si at 300 K if the intrinsic carrier concentration is 1.5 x 106 atom/m3. The sample is then doped with 1023 phosphorus atom/m3. Determine the equilibrium holeconcentration, conductivity, and position of the Fermi level relative to the intrinsic level.​

A 3405 Kg stone is a place on top of cylindrical concrete (y=2.3X10^10 N/m^2 and a height of 2.1m. By how much the statue compress the stand

Which of the following are valid units for electric field

if the scientist only performed 1 experiment but it supported their hypothesis, why cant it not be considered a theory

A playground is on the flat roof of a city school, 6.00m above the street below. The vertical wall of the building is h=7.00m high, forming a 1-m-high railing around the playground. A ball has fallen to the street below, and a passerby returns it by launching it at an angle ofɵ=53.0^oabove the horizontal at a point d=24.0 m from the base of the building wall. The ball takes 2.20s to reach a point vertically above the wall. Find the vertical distance by which the ball clears the wall.

A particle moves along the x-axis according to the equation, where x is in meters and t is in seconds. At t=3.00s, find the acceleration of the particle.