The kinetic energy of photoelectrons emitted by a photo sensitive surface depends on

Silicon diodes have __________ reverse resistance than germanium diodes.

Consider the following statements about conditions that make a metal semiconductor contact rectifying

1. N type semiconductor with work function φ_s more than work function φ_M of metal
2. N type semiconductor with work function φ_s less than work function φ_M of metal
3. P type semiconductor with work function φ_s more than work function φ_M of metal
4. P type semiconductor with work function φ_s less than work function φ_M of metal.

Of these statements

For radiating ultraviolet rays, LEDs use

The current due to thermionic emission is proportional to