Electrical Properties

Question 1

When’s metallic behaviour found

Answer 1

Partially filled bands as electrons need filled and empty state to be able to move

Question 2

Semiconductors and insulators

Answer 2

Bandgap between valence and conduction bands, electrons can be excited using thermal energy across bandgap

Question 3

Sp band

Answer 3

2S and 2p AO are close in energy and overlap of s and p-bands form hybridsed band that can hold up to 8 electrons

Question 4

Doping

Answer 4

Doping with another element that has more or less valence electrons can improve conduction

Question 5

P-type extrinsic semiconductors

Answer 5

Doped with material with less valence electrons, extra holes in valence bands

Question 6

N-type extrinsic semiconductors

Answer 6

Doped with material with more electrons, extra electrons in conduction band

Question 7

Photoconductors

Answer 7

Semiconductors with band gap energies corresponding to photons of visible light, photon absorption excites electron into conduction band

Question 8

Superconductors

Answer 8

Conduct with no electrical resistance below critical temp, Tc

Question 9

Electrical resistivity of metals

Answer 9

Increases with increasing T

Question 10

Wavelength of visible light

Answer 10

400-800 nm

Question 11

Why does electrical resistivity increase with temperature?

Answer 11

At higher temps the electrons vibrate more to there’s more knocking making to harder for them to move