Topic 23 Flashcards
1
Q
What is the photoelectric effect?
A
Illumination a metal causes release of electrons
Light consists of particles called photon
2
Q
Equation to calculate the energy of a photon
A
E = hν
3
Q
Give the Photoelectric Einstein Equation
A
hν = W + Ekin
- W = Work needed to release an electron*
- E = Maximum kinetic energy*
4
Q
Describe the photoelectron multiplier
A
An electron is released and accelerated against another metal. Causing more electrons.
5
Q
Give the main experiemental observations of the photoelectric effect
A
Max kinetic energy of emitted electrons dependent on frequency of light only
Intensity of the photocurrent is proportional to the light intensity
Photocurrent starts instantly once light hits the cathode
No electrons are emitted below the cut-off frequency
