Week 9 Flashcards
Electromagnetic Energy
term used to describe all the different kinds of energies released into space by stars such as the Sun
Electromagnetic Spectrum
the range of wavelengths or frequencies over which electromagnetic radiation extends.
Transparent
allowing light to pass through so that objects behind can be distinctly seen.
Opaque
not able to be seen through; not transparent.
Quantum
a discrete quantity of energy proportional in magnitude to the frequency of the radiation it represents.
Photon
a particle representing a quantum of light or other electromagnetic radiation.
Emission Spectrum
a spectrum of the electromagnetic radiation emitted by a source.
Absorption Spectrum
a spectrum of electromagnetic radiation transmitted through a substance, showing dark lines or bands due to absorption at specific wavelengths.
Fluorescence
the visible or invisible radiation produced from certain substances as a result of incident radiation of a shorter wavelength such as X-rays or ultraviolet light.
Phosphorescence
the emission of radiation in a similar manner to fluorescence but on a longer timescale, so that emission continues after excitation ceases.
Photoelectric Effect
the emission, or ejection, of electrons from the surface of, generally, a metal in response to incident light.
Electron volt
a unit of energy equal to the work done on an electron in accelerating it through a potential difference of one volt
