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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

An object which is electrically neutral contains only neutrons.

Which of the following are valid units for electric field

A 140 kN force with a slope of 4 vertical and 7 horizontal is located on the second quadrant. Determine its y- component.

An automobile and a truck start from rest at the same instant, with the automobile

initially at some distance behind the truck. The truck has a constant acceleration of 2

m/s2 and the automobile at an acceleration of 3 m/s2

. The automobile overtakes the

truck after the truck has moved 75 m. Try to draw the figure.

a) How long does it take the auto to overtake the truck?

b) How far was the auto behind the truck initially?

c) What is the velocity of each when they are abreast?

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

16. In a circuit 20 C of charge is passed through a battery in a given time. The plates of the battery are maintained at PD of 20 V . How much work is done by the battery?

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=53.0oabove 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.

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