Brightness And Blackbody Radiation Flashcards
Sources of gamma rays
Produced in nuclear reactions
Sources of x rays
Gas in clusters of galaxies, supernova remnants, solar corona
Sources of UV
Supernova remnants, very hot stars
Sources of visible radiation
Stars
Sources of infrared
Cool clouds of dust and gas, planets, moons
Sources of microwave
Active galaxies, pulsars, cosmic background radiation
Sources of radio
Supernova remnants, pulsars, cold gas
Measures of brightness
Luminosity, flux
What is black body radiation
The ideal form of radiation in which an on neck absorbs all radiation coming into it causing atoms to heat up and re radiate the energy until there is a balance between absorption and emission
The branch of science concerned with the investigation and measurement of spectra produced when matter interacts with or emits electromagnetic radiation
Spectroscopy
How do we break up light into its components
Prism or diffracting grating
Continuous spectrum
All colors present: emitted by a solid or very dense gas
Absorption spectrum
Some dark lines and bands on an otherwise continuous spectrum: looking at white light through a layer of cool thin gas
Emission spectrum
Only a few bright lines and bands, emitted by a thin hot gas
Who said matter is a fundamental building block called the atom
Leucippus, Democritus
Who said matter was made up of combinations of four elements
Aristole
Who discovered the electron using the plum pudding model saying electrons were small particles floating in a sea of diffuse positive charge
JJ Thomson
What was the Rutherford experiment
Rutherford shot alpha particles at a super thin layer of gold foil and found that the nucleus of an atom is positive
Niels Bohr
Electrons could occupy only discrete energy levels around a nucleus
Who found the atom
John dalton
How do we find spectra
Let light pass through a prism or diffraction grating, by doing this we separate light into different wavelengths
Which type of spectrum comes directly from a black body
Continuous
Which type of spectrum comes from observing a warm diffuse
Emission
Which type of spectrum comes from looking at a black body through a cool layer of gas
Absorption
