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ASTR 121|60 MIDTERM—ALBRIGHT Quiz Questions Well Solved|2024/2025 CA$11.60   Add to cart
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ASTR 121|60 MIDTERM—ALBRIGHT Quiz Questions Well Solved|2024/2025
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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...

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  • August 26, 2024
  • 6
  • 2024/2025
  • Exam (elaborations)
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  • astr 12160 midterm

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  • ASTR 121
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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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