The apparent motion of a foreground object relative to a distant background as the observers position
changes? - Parallax
When measuring parallax the distance between two observation points is called? - Baseline
If Earth rotated twice as fast as it currently does, but its motion around the Sun s...
ASTR 102 Midterm Exam Questions |
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The apparent motion of a foreground object relative to a distant background as the observers position
changes? - ✔✔Parallax
When measuring parallax the distance between two observation points is called? - ✔✔Baseline
If Earth rotated twice as fast as it currently does, but its motion around the Sun stayed the same, then?
A. The night would be twice as long
B. The night would be half as long
C. The year would be half as long
D. The length of the day would be unchanged. - ✔✔B.
A long, thin cloud that stretched from directly overhead to the western horizon would have an angular
size of?
A. 45°
B. 90°
C. 180°
D. 360°. - ✔✔B.
If Earth orbited the sun in 9 months instead of 12, then compared with a sidereal day, a solar day would
be?
A. Longer
B. Shorter
C. Unchanged - ✔✔A.
When a thin crescent of the Moon is visible just before sunrise, the Moon is in its?
A. Waxing phase
,B. New Phase
C. Waning Phase
D. Quarter Phase - ✔✔C.
If the Moon's orbit were a little larger, solar eclipses would be?
A. More likely to be annular
B. More likely to be total
C. More frequent
D. Unchanged in appearence - ✔✔A.
If the Moon orbited the Earth twice as fast but in the same orbit the frequency of solar eclipses would?
A. Double
B. Be cut in half
C. Stay the same - ✔✔C.
A smaller Earth would result in a?
A. A smaller parallax angle
B. A shorter distance measured to the object
C. A larger apparent displacement
D. Stars appearing closer together - ✔✔A.
Today, distances to stars are measured by
A. Reflected laser beams
B. bouncing radar signals
C. Travel time by spacecraft
D. Geometry - ✔✔D.
The distance between successive wave crests is known as?
A. Period
B. Wavelength
,C. Amplitude
D. Wavelength - ✔✔B.
The length of time it takes a wave to complete one cycle?
A. Period
B. Wavelength
C. Frequency
D. Amplitude - ✔✔A.
The size of disturbance associated with a wave?
A. Period
B. Wavelength
C. Frequency
D. Amplitude - ✔✔D.
The number of wave crests that pass a given point in one second?
A. Period
B. Amplitude
C. Wavelength
D. Frequency - ✔✔D.
The colour of visible light is a measure of its?
A. Wavelength
B. Frequency
C. Amplitude
D. Magnitude - ✔✔A.
The __________ of an object is a measure of the speed with which its content particles move.
A. Colour
B. Temperature
, C. Transparency
D. Visibility - ✔✔B.
A blackbody curve is dependant on an objects?
A. Colour
B. Visibility
C. Temperature
D. Chemical Makeup - ✔✔C.
______ law tells us that the wavelength at which an object radiates most of its energy is inversely
proportional to its temperature. - ✔✔Wien's
_________ law states that the total amount of energy radiated is proportional to the fourth power of
temperature. - ✔✔Stefan's
Compared with ultraviolet radiation, infrared radiation has a greater?
A. Wavelength
B. Amplitude
C. Frequency
D. Energy - ✔✔A.
An electron that collides with an atom will?
A. Cease to have an electric field
B. Produce an electromagnetic wave;
C. Change it's electric charge
D. Become magnetized - ✔✔B.
An X-ray telescope located in Antarctica would not work well because?
A. The extreme cold
B. The ozone hole
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