Light
A quanta of radiation (photons)
Photoelectric effect
The emission of photoelectrons from a clean metal surface when EM radiation above a threshold frequency is incident on the metal.
Photoelectrons
Electrons emitted from the surface of a metal caused by the photoelectric effect.
Threshold frequency
The minimum frequency of the electromagnetic radiation that will cause the emission of a photoelectron , measured in Hz
Work function
The minimum energy needed to remove a single electron from the surface of a particular metal , measured in J
Photon
A quantum of EM energy , its energy is given by E=hf
Plancks constant
Symbol h , equals 6.63x10^-34 Js
Stopping potential
The minimum potential needed to stop the photoelectric effect
Ionisation
When an electron escapes from well and joins the continuum, minimum energy supplied for an electron to escape highest energy state.
Ground state
The lowest energy state an electron can exist in
Emission spectra
Produced when excited electrons release energy to go back to ground state
Absorption spectra
Produced when electrons absorb specific amounts of energy and change energy states so become excited
Excited
An atom containing an electron or electrons that have absorbed energy and have been boosted into a higher energy level
Wave partial duality
A theory that states that matter has both particle and wave properties and also EM radiation has wave and particulate nature.
Wave nature and phenomena
-Wavelengths
-frequency
-Massless
Diffraction and refraction
Particle nature and phenomena
-kinetic energy
-linear momentum
The photoelectric effect
Diffraction
The phenomena in which waves passing through a gap or around an obstacle spread out
