turning points Flashcards
Black body
a body that can absorb all wavelengths of electromagnetic radiation and can emit all wavelengths of electromagnetic radiation
Cathode ray tube
a vacuum tube containing one or more electron guns, which emit electron beams that are manipulated to display images on a phosphorescent screen
Viscosity
a measure of how thick a fluid is
Compton effect
the effect that is observed when x-rays or gamma rays are scattered on a material with an increase in wavelength.
Quantised
to subdivide into small but measurable increments
Quantum tunneling
A quantum mechanical phenomenon when a particle is able to penetrate through a potential energy barrier that is higher in energy than the particle’s kinetic energy
Scanning tunneling microscope
a type of scanning probe microscope used for imaging surfaces at the atomic level.
Stephan-Boltzmann law
the magnitude of the radiation output of an object is directly proportional to the fourth power of its surface temperature
Stokes law
The force that retards a sphere moving through a viscous fluid is directly proportional to the velocity and the radius of the sphere, and the viscosity of the fluid.
Thermionic emission
the release of free electrons from a metals surface when the metal is heated
Transmission electron microscope
TEM uses transmitted electrons (electrons that are passing through the sample) to create an image
Ultraviolet catastrophe
The prediction of classical electromagnetism that the intensity of the radiation emitted by an ideal black body at thermal equilibrium goes to infinity as wavelength decreases
Wien’s displacement law
The black-body radiation curve for different temperatures will peak at different wavelengths that are inversely proportional to the temperature
Photoelectric effect
The emission of electrons from a metal when a light with a high enough frequency is shone on it
Balanced fields
Passing a beam of electrons between two charged plates in the presence of a perpendicular magnetic field.
Crossed fields
Electric field and magnetic field which are uniform and are perpendicular to each other
