This is the 1st HTML5 slant canvas

KIWY logo depicting a kiwi bird with a candle

k i w y

Need a light for your site?

This is the 2nd HTML5 slant canvas

Condensed Matter

aka Solid State Physics, or Statistical Mechanics

Problem 1

According to the BCS theory, the attraction between Cooper pairs in a superconductor is due to

  1. the weak nuclear force
  2. interactions with the ionic lattice
  3. vacuum polarization
  4. the Casimir effect
  5. the strong nuclear force

Solution 1

B

Problem 2

Which of the following ions CANNOT be used as dopant in germanium to make an n-type semiconductor?

  1. As
  2. P
  3. B
  4. Sb
  5. N

Solution 2

C

Problem 3

652

The conventional unit cell of a body-centered cubic Bravias lattice is shown in the figure above. The conventional cell has volume a3. What is the volume of the primitive unit cell?

  1. a3 / 8
  2. a3
  3. a3 / 4
  4. a3 / 2
  5. 2 a3

Solution 3

D

Problem 4

Which of the following best represents the temperature of the resistivity of an undoped semiconductor?

  1. 653
  2. 653
  3. 653
  4. 653
  5. 653

Solution 4

C

Problem 5

Which of the following statements concerning the electrical conductivities at room temperature of a pure copper sample and pure silicon sample is FALSE?

  1. If the temperature of the copper sample is increased, its conductivity will decrease.
  2. The addition of impurity in the silicon sample always decreases its conductivity
  3. The addition of impurity in the copper sample always decreases its conductivity
  4. If the temperature of the silicon sample is increased, its conductivity will decrease.
  5. The conductivity of the copper sample is many orders of magnitude greater than that of the silicon sample.

Solution 5

E