semiconductor

Question 1

crt

Answer 1

cathode ray tubes

Question 2

order of conductivity of conductors

Answer 2

10²-10⁸

Question 3

order of conductivity of insulators

Answer 3

10^-11 - 10^-19

Question 4

order of conductivity of semiconductor

Answer 4

10^-6 -10⁵

Question 5

valence band

Answer 5

lower band completely occupied by 4n val. e at absolute 0 temp

Question 6

how many e are freed when a bond breaks

Answer 6

10²⁹

Question 7

pentavalent dopants

Answer 7

arsenic, antimony, phosphorus

Question 8

trivalent dopants

Answer 8

indium, boron, aluminium

Question 9

What is the state of the valence and conduction bands in semiconductors at room temperature?

Answer 9

The valence band is completely filled and the conduction band is partially filled.

Question 10

Where is the acceptor valence band located in a p-type semiconductor?

Answer 10

The acceptor valence band is close to the valence band of the host crystal.

Options: (a) close to the valence band of the host crystal (b) close to conduction band of the host crystal (c) below the conduction band of the host crystal (d) above the conduction band of the host crystal

Question 11

when n type is heated, what happens to holes and e

Answer 11

no of both increases equally

Question 12

relation between no of free e and temp (semiconductor)

Answer 12

n is proportional to T^3/2

Question 13

photodiode bias

Answer 13

rev

Question 14

Si/Ge which is preferred for semiconductor devices

Answer 14

Si