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AST 111 Exam prep Test with Questions Solved 100% Correct
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AST 111 Exam prep Test with Questions Solved 100% Correct
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AST 111 Exam prep Test with QuestionsSolved 100% Correct
Absorption is the process where an _____ captures _____ from a passing photon -
✔✔atom;energy
Blueshift - ✔✔The Doppler shift toward shorter (bluer) wavelengths of light from an
approaching object
Redshift - ✔✔Doppler shift toward longer (redder) wavelengths of light from an approaching
object.
Doppler shift is the amount by which the ___ of light is shifted - ✔✔wavelength
Radial velocity is the component of velocity that is directed ______ or ____ from the observer -
✔✔toward;away
Thermal equilibrium is when the rate of thermal energy _______ by an object is ______ to the
rate of thermal energy _________ - ✔✔emission;equal;absorption
Temperature is the measure of the average ____ energy of the atoms or molecules in a gas,
solid, or liquid - ✔✔kinetic
Thermal motion is the random ________ of atoms, molecules, and particles that give rise to
_______ _________ - ✔✔motion;thermal radiation
Absolute zero is the temperature at which _______ motions cease - ✔✔thermal
, Thermal radiation is electromagnetic ______ coming from random motion of ______ particles
in _____ substance - ✔✔radiation;charged;every
Luminosity is the total amount of light _______ by an object - ✔✔emitted
Blackbody is an object that _____ and can _____ all electromagnetic energy it receives -
✔✔absorbs;reemit
Planck/Blackbody spectrum is the spectrum of electronmagnetic energy emitted by a ______
per unit area per second which is determined only by the ____ of the object. -
✔✔blackbody;temperature
Wien's law - ✔✔A law, named for Wilhelm Wien, stating that location of the peak
wavelength in the electromagnetic spectrum of an object is inversely proportional to the
temperature of the object. (page 131)
Brightness is the apparent ________ of light from a luminous object.
Brightness depends on the ________ of a source and its ________. -
✔✔intensity;luminosity;distance
Astronomers identify color with this property - ✔✔Wavelength
In the visible range what color has longest wavelength; what has the shortest - ✔✔red;violet
Spectrum is the ___ of colors - ✔✔Spread
Diffraction grating or spectroscope - ✔✔used to see the range of colors
Continuum source - ✔✔Uninterrupted rainbow of colors
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