Honors Astronomy Exam 1
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Created by:
stephmac19 on September 12, 2011
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74 terms
Terms | Definitions |
|---|---|
 When we observe a galaxy 10 LY away, | we see it as it was a billion years ago |
| Ages of stars are | NOT "millions of light years" |
| A wavelength of 10 microns is | in the infrared part of the spectrum |
| By measuring the light intensity from a distant light bulb, you can calculate its distance if you know the bulb's | wattage |
| In astronomy we try to | catalog objects and determine their origin |
| A hypothesis that passes initial testing | is ranked as a theory |
| An emission line with a wavelength of 6563 angstroms is | red |
| The most energetic photon is | ultraviolet |
| According to the Stephen-Boltzmann Law, if the sun were twice as hot as it is, | it would be 16 times more luminous |
| The sun has | a absorption-line spectrum |
| In a hydrogen atom, | the proton has the most mass |
| A star with a surface temp of 10^4 K would be | bluer than the sun |
| A line in the Balmer series of hydrogen is | visible |
| Red shifts in wavelength are produced by | recession |
| The surface temp of the sun is about | 5800 K |
| The light-gathering power of a telescope is proportional to its | area |
| Both Newtonian and Cassegrain telescopes | use 2 mirrors |
| Interferometers have | better angular resolution than ordinary telescopes |
| Spectrometers have | gratings |
| If the sin is setting and the moon is rising, | the moon is in the full phase |
| To see a total solar eclipse, you must be in the | umbra |
| How long a star is above the horizon depends on its | declination |
| Precession takes about | 26000 years |
| Some stars have | negative apparent magnitudes |
| The declination of Polaris is about | 90 degrees |
| Fayetteville is at a latitude of about | 36 degrees |
| In Grenwich, England, it is | later in the day now than it is in Fayetteville |
| The ecliptic is a projection of | the Earth's orbital plane |
| In Fayetteville at noon, the sun is farthest south in the | winter |
| Planets usually move | west-to-east relative to the fixed stars |
| In Ptolemy's model | the planets orbited the Earth |
| Can stellar parallax be measured these days? | yes, but hey are less than an arc second |
| The moons of Jupiter were discovered by | Galileo |
| The F=ma law was discovered by | Newton |
| Unlike Kepler's 3rd law, Newton's result contained | masses |
| The plane of the orbits of the planets is a remnant of | the spin of the gas and dust cloud that spawned them |
| When we observe an object 10 billion light years away, we see it | as it was in the past |
| A photon of wavelength 5500 Å is in | the visible part of the spectrum. |
| My body emits mainly | infrared radiation |
| Blue photons carry | more energy than red photons |
| Wavelengths observed by ground-based telescopes are | limited by the atmosphere |
| The sun has | its peak wavelength in the visible |
| A light bulb radiates | a continuous spectrum |
| In the Bohr model downward transitions produce | emission lines |
| The Doppler effect measures | the radial component of the velocity |
| The boiling point of water in K is | 373 |
| In a telescope, the objective | gathers the light |
| The resolution of ground-based telescopes is limited to about 2 arcsec because | the "seeing" effects |
| A spectrogram may be displayed in the form of a graph of | intensity and wavelength |
| Lunar eclipses only happen when the moon is | full |
| Lunar eclipses can only happen during | during eclipse season |
| From the Earth's equator, the North Celestial Pole is | on the Northern horizon |
| The Sun appears to move | along ecliptic |
| Suring summer in Fay, the Sun is | farthest north of the celestial equator |
| Epicycles were invented to | explain retrograde motion |
| The major planets all show | prograde revolution |
| His model used epicycles | Ptolemy |
| In Copernicus' model, retrograde motion was due to | motion of the observer |
| In Kepler's model, | the Sun is at one focus of the elliptical orbit |
| Kepler's 2nd law is known as | the "equal areas" law |
| An astronomical unit is | the distance of the Earth to the Sun |
| When we observe the stars near the Sun, we see them as they were | years ago |
| If we know the ___ of an object, we can calculate its distance from its apparent brightness. | energy output |
| Light waves longer than infrared are in the ___ part of the spectrum. | radio |
| If you know the size and angular diameter of an object, you can calculate its | distance |
| Black bodies radiate a(n) ___ spectrum. | continuous |
| Upward transitions in the atom's electron orbits produce | absorption lines |
| The bigger the blue shift is, the | faster the approach is |
| The largest telescopes are | reflecting telescopes |
| A spectrometer contains | a collimator |
| Full moon rises at | sunset |
| The faintest stars visible to naked eye are | magnitude of 6 |
| In Ptolemy's model, | Earth was not on the epicycle |
| The line connecting the Sun to the planet is called | radius vector |
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