ASTR 121|60 MIDTERM—ALBRIGHT Quiz Questions Well Solved|2024/2025
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Course
ASTR 121
Institution
ASTR 121
absolute magnitude - ️️The actual brightness of a star
absorption line spectrum - ️️A cloud of gas between us and a light bulb can absorb light of specific wavelengths, leaving dark absorption lines in the spectrum
apparent magnitude - ️️the brightness of a star as seen from Earth...
absolute magnitude - ✔ ✔ The actual brightness of a star
absorption line spectrum - ✔ ✔ A cloud of gas between us and a light bulb can absorb light of
specific wavelengths, leaving dark absorption lines in the spectrum
apparent magnitude - ✔ ✔ the brightness of a star as seen from Earth
arcminute - ✔ ✔ 1/60 of a degree
arcsecond - ✔ ✔ 1/3600 of a degree
blue shift - ✔ ✔ the displacement of the spectrum to shorter wavelengths in the light coming from
distant celestial objects moving toward the observer.
chromatic aberration - ✔ ✔ the focusing of different colors of light at different distances behind a
lens
continuous spectrum - ✔ ✔ the uninterrupted broad band of all colors (wavelengths) emitted by
incandescent solids
Convection - ✔ ✔ The transfer of heat by the movement of a fluid
Describe how astronomers measure the diameter of stars - ✔ ✔ Using eclipsing binaries, measure
how long it takes for one star to be eclipsed, how the velocity from the Doppler shifts.
, Describe how astronomers use spectra to determine the composition of stars. - ✔ ✔ Match
absorption lines in the spectrum with known lines of elements
Describe the spectral classification system both classes and subclasses. - ✔ ✔ Temperature sequence
from hot-cold: OBAFGKML, with 0-9 subclass within each
diagram - ✔ ✔ a drawing intended to explain how something works
Doppler effect - ✔ ✔ An observed change in the frequency of a wave when the source or observer is
moving
E=mc^2 - ✔ ✔ Einstein's equation proposing that energy has mass; E is energy, m is mass, and c is
the speed of light
electromagnetic - ✔ ✔ relating to the interrelation of electric currents or fields and magnetic fields.
electromagnetic radiation - ✔ ✔ a form of energy that exhibits wavelike behavior as it travels
through space
emission line spectrum - ✔ ✔ a diagram or graph that indicates the degree to which a substance
emits radiant energy with respect to wavelength
energy level - ✔ ✔ a region of an atom in which electrons of the same energy are likely to be found
energy level diagram - ✔ ✔ A diagram showing the arrangement of an atom's energy levels.
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