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Answer to Question #257551 in Physics for Vishal


Answer to Question #257551 in Physics for Vishal


Find the electric flux in a sphere of radius 0.48 cm from a charge of 55 nC.




What is Lorentz number? The thermal and electrical conductivities of Cu at 20oC are 390 Wm-1K-1 and

5.87x107W-1m-1 respectively. Calculate Lorentz number.​​


a fixed mass of gas at costant presure has a volume of 100°c find its volume at temperature of 54°c


Earth orbits the sun once every 365.25 days.




Find the average angular speed of Earth




about the sun.




Answer in units of rad/s.

Question 5

 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 1.5x106 atom/m3. The sample is then doped with 1023 phosphorus atom/m3. Determine the equilibrium hole concentration, conductivity, and position of the Fermi level relative to the intrinsic level.​


5.2​ Indicate on an energy level diagram the conduction and valence bands, donor and acceptor states and the position of Fermi level for

(i) an intrinsic semiconductor.

(ii) a n-type semiconductor.

(iii) a p-type semiconductor.​


Question 3

 If the velocity of sound in a solid is of the order 103 m/s, compare the frequency of the sound wave λ = 20 Å for (a) a monoatomic system and (b) acoustic waves and optical waves in a diatomic system containing two identical atoms (M=m) per unit cell of interatomic spacing 2.2 Å.​​​​​​

 

Question 4

 4.1 ​The conductivity of silver is 6.5 x107 per Ohm per m and number of conduction electrons per m3 is 6x1028 Find the mobility of conduction electrons and the drift velocity in an electric field of 1 V/m. Given m = 9.1 x 10-31kg and e=1.602 x 10-19C.​​​​​​​

 

4.2​ What is Lorentz number? The thermal and electrical conductivities of Cu at 20oC are 390 Wm-1K-1 and 5.87x107W-1m-1 respectively. Calculate Lorentz number.​​


Question 1​​​​​​​​​​​​

 Compute the net potential energy of a simple Na+Cl- pair. The equilibrium distance between the ions is 0.28nm. The potential energy due to repulsion between electrons is given by Ur= β/r8


Question 2

2.1α-Co has an hcp structure with lattice spacings of a= 2.51 Ao and c = 4.07 Ao, β Co is fcc, with a cubic lattice spacing of 3.55 Ao. What is the difference in density between the two forms?​​

2.2​ Sodium transform from bcc to hcp at about T = 23K. Assuming that the density remains fixed, and the c/ ratio isideal, calculate the hcp lattice spacing given that the cubic lattice spacing is  a' = 4.23 Ao in the cubic phase.      ​​​



​Indicate on an energy level diagram the conduction and valence bands, donor and acceptor states and the position of Fermi level for

(i) an intrinsic semiconductor.

(ii) a n-type semiconductor.

(iii) a p-type semiconductor.


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