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37 Cards in this Set
- Front
- Back
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a high frequency will give a __________wavelength |
short |
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white light is |
a combination of many colors |
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all forms of electromagnetic radiation arranged according to wavelength and frequency is called |
electromagnetic spectrum |
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the spectroscope has shown us that |
the sun is made of hydrogen |
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a complete oscillation of a wave is measured from |
crest to crest |
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a device that splits light into a SPECTRUM for analysis is called |
SPECTRoscope |
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on the electromagnetic spectrum, visible light is located |
in the middle |
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the sun is responsible for ________ of the electromagnetic waves of the spectrum. |
all |
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for an electric wave and a magnetic wave, they must oscillate at |
right angles |
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space is referred to as a vacuum because |
there is nothing there |
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how fast the wave oscillates is its |
frequency |
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the most important instrument used by astronomers |
telescope |
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the points on the ecliptic midway between the 2 equinoxes are called |
solstices |
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the ecliptic crosses the celestial equator |
2 times every year |
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for every 70 miles of travel, a watch will gain or lose |
4 minutes |
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the climate zone that always has a very climate all year is the |
torrid zone |
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the amount it takes for the sun to cross the meridian 2 times is called |
apparent solar day |
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the autumnal equinoxes happens in |
September |
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after much adjusting, the time system in use today is |
standard solar time |
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the imaginary line in the sky directly overhead that extends north and south to the celestial poles is called the |
meridian |
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the vernal equinoxes happens in |
March |
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another name for the celestial EQUATOR is |
EQUInoctial |
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one solar day equals |
exactly 24 hours |
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the path the sun appears to follow in a year is called the |
ecliptic |
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our present time system is based on the |
mean solar day |
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when the day and night are of equal lengths, the earth is in |
equinox |
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the point on the celestial sphere directly above an observer is the |
zenith |
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in standard solar time, each time zone differs from its neighbor by exactly |
1hour |
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one rotation of the earth relative to the stars is called the |
sidereal day |
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of velocity changes so that the speed decreases, the object is experiencing |
negative acceleration |
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the attraction that allows molecules of the same kind of matter to stick together is |
cohesion |
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if an object's direction changes, it's experiencing |
positive acceleration |
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the speed of the earth around the sun determines |
the length of seasons |
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mass per unit volume of a substance is its |
density |
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the earth is moving faster when it's |
passing near the sun |
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when 2 or more atoms are linked together, the resulting mass is always called |
molecules |
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c |
