Test #2 Astronomy

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24 Terms

1
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A star with a proper name (like sirius) is most likely a ____ star

Bright

2
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Compared to the Earth-Sun distance (=1 astronomical unit), stars are ____ from Earth.

Much more distant

3
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A star whose measured parallax is 0.1 seconds of arc is located at a distance of ____ parsecs

10

4
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The apparent brightness (apparent magnitude m) of a star just barely visible to the naked eye is _____

6

5
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The greater the distance Modulus (m - M) of a star, the ____ distant it is from Earth

More

6
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All other things being equal for these two stars, the blue star is _____ the red star

Hotter than

7
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All other things being equal for these two stars, the blue star is ____ the red star

More luminous than

8
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A star like the Sun has a spectral class ____

G

9
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The hottest stars have spectral class

O

10
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Stars are composed mainly of

hydrogen

11
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The wavelength range for visible light is 400 to 700 nanometers. For diffraction to happen for visible light the obstacle

Must be in this range of sizes

12
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The most energetic light is

Blue

13
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The energy of the first level of hydrogen is

-13.6

14
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The energy of the second level of hydrogen is

-3.4

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