Name: 
 

SGC EXAM 1 web



Completion
Complete each sentence or statement.
 

 1. 

The _______________ is the point on the celestial sphere directly above an observer, regardless of where the observer is located on Earth.
 

 

 2. 

A(n) _______________ is the largest known structure in the universe.
 

 

 3. 

The process of removing an electron from a stable nucleus is known as _______________.
 

 

 4. 

The _______________ of a star can be determined from its color.
 

 

 5. 

Which planets are never visible near the eastern horizon at sunset?
 

 

 6. 

The number 52,600,000,000 would be written in scientific notation as _______________.
 

 

 7. 

Light takes about 8 minutes to travel from the sun to Earth and about 40 minutes to travel from the sun to Jupiter. Jupiter is about _______________ AU from the sun
 

 

True/False
Indicate whether the sentence or statement is true or false.
 

 8. 

A light-year is the distance light travels in one year.
 

 9. 

The sun is a star in the Milky Way Galaxy.
 

 10. 

The celestial equator always crosses the horizon at the east point and west point.
 

 11. 

A kilometer contains 1 million meters.
 

 12. 

The metric system is a decimal system.
 

 13. 

Hydrogen alpha is the longest wavelength Balmer line.
 

 14. 

An absorption spectrum is also called a bright line spectrum.
 

 15. 

Light can behave as a particle or as a wave.
 

 16. 

Blue stars are hotter than red stars.
 

 17. 

Light with a wavelength of 300 nm has a lower frequency than light with a wavelength of 500 nm.
 

 18. 

The nearest star is 1 ly from the solar system.
 

 19. 

The Doppler effect is sensitive only to motion along the line of sight.
 

Multiple Choice
Identify the letter of the choice that best completes the statement or answers the question.
 

 20. 

A galaxy contains
a.
large amounts of gas and dust but very few stars.
b.
primarily planets.
c.
a single star and planets.
d.
large amounts of gas, dust, and stars.
e.
thousands of superclusters.
 

 21. 

4.4sgc_exam_1_web_files/i0240000.jpg106 divided by 8.8sgc_exam_1_web_files/i0240001.jpg1010 is equal to
a.
3.9sgc_exam_1_web_files/i0240002.jpg1016.
b.
5.0sgc_exam_1_web_files/i0240003.jpg10-4.
c.
5.0sgc_exam_1_web_files/i0240004.jpg104.
d.
3.9sgc_exam_1_web_files/i0240005.jpg1017.
e.
5.0sgc_exam_1_web_files/i0240006.jpg10-5.
 

 22. 

What is the energy of the photon whose wavelength is 400 nm?
a.
1.2sgc_exam_1_web_files/i0250000.jpg1012 m
b.
7.5sgc_exam_1_web_files/i0250001.jpg104 Hertz
c.
5.0sgc_exam_1_web_files/i0250002.jpg10-19 Joules
d.
1.3sgc_exam_1_web_files/i0250003.jpg10-5 m
e.
2.7sgc_exam_1_web_files/i0250004.jpg10-30 Joules
 

 23. 

There are _______________ nanometers in one meter.
a.
1sgc_exam_1_web_files/i0260000.jpg103
b.
1sgc_exam_1_web_files/i0260001.jpg10-9
c.
400
d.
1sgc_exam_1_web_files/i0260002.jpg10-3
e.
1sgc_exam_1_web_files/i0260003.jpg109
 

 24. 

The celestial equator is
a.
a line around the sky directly above Earth's equator.
b.
the dividing line between the north and south celestial hemispheres.
c.
the path that the sun appears to follow on the celestial sphere as Earth orbits the sun.
d.
a and b.
e.
a and c.
 

 25. 

_______________ has (have) wavelengths that are shorter than visible light.
a.
Gamma-rays
b.
Ultraviolet light
c.
Infrared radiation
d.
Radio
e.
a and b
 

 26. 

An observer in the Northern Hemisphere watches the sky for several hours. Due to the motion of Earth, this observer notices that the stars near the north celestial pole appear to move
a.
clockwise.
b.
nearly vertically upward.
c.
from left to right.
d.
counter clockwise.
e.
from right to left.
 

 27. 

2.9sgc_exam_1_web_files/i0300000.jpg107 is the same as
a.
29 thousand.
b.
290 thousand.
c.
29 million.
d.
2.9 million.
e.
2.9 thousand.
 

 28. 

An observer on Earth's equator would find
a.
Polaris 40° above the northern horizon.
b.
the celestial equator passing directly overhead.
c.
Polaris directly overhead.
d.
that the ecliptic coincides with the horizon.
e.
that the celestial equator coincides with the horizon.
 

 29. 

If the light takes 8 minutes to reach Earth from the sun and the nearest star is 4.7 ly from the sun, what is the distance from the sun to the nearest star in astronomical units?
a.
310,000 AU
b.
1.7 AU
c.
1.5sgc_exam_1_web_files/i0320000.jpg1011 AU
d.
37.6 AU
e.
214 AU
 

 30. 

The Hγ line has a wavelength of 434.0 nm when observed in the laboratory. If the Hγ line appears in a stars spectrum at 434.5 nm, what is the radial velocity of the star?
a.
346 km/sec away from the observer.
b.
1.3sgc_exam_1_web_files/i0330000.jpg108 m/sec toward the observer.
c.
1.3sgc_exam_1_web_files/i0330001.jpg108 m/sec away from the observer.
d.
The radial velocity of the star can not be determined from this information.
e.
346 km/sec toward the observer.
 

 31. 

Which of the following can be determined by using the Doppler effect?

I.
The speed at which a star is moving away from an observer.
II.
The transverse velocity of a star.
III.
The radial velocity of a star.
IV.
The speed at which a car is traveling toward an observer.
a.
I & III
b.
I, III, & IV
c.
I & IV
d.
II & IV
e.
II & III
 

 32. 

What is the wavelength of the shortest wavelength light visible to the human eye?
a.
400 nm
b.
700 nm
c.
7000 nm
d.
4000 nm
e.
3sgc_exam_1_web_files/i0350000.jpg108 m
 

 33. 

A wave traveling at a speed of 90 meters per second with a frequency of 60 Hz would have a wavelength of
a.
1.5 meters.
b.
540 nm.
c.
90 meters.
d.
60 meters.
e.
5400 meters.
 

 34. 

_______________ has (have) wavelengths that are longer than visible light.
a.
Gamma-rays
b.
Ultraviolet light
c.
Infrared radiation
d.
X-rays
e.
a, b and d above
 

 35. 

3.0sgc_exam_1_web_files/i0380000.jpg105 times 1.5sgc_exam_1_web_files/i0380001.jpg109 is equal to
a.
2.0sgc_exam_1_web_files/i0380002.jpg1045.
b.
4.5sgc_exam_1_web_files/i0380003.jpg1045.
c.
2.0sgc_exam_1_web_files/i0380004.jpg1014.
d.
2.0sgc_exam_1_web_files/i0380005.jpg104.
e.
4.5sgc_exam_1_web_files/i0380006.jpg1014.
 

 36. 

Violet light has a wavelength of approximately _______________.
a.
700 nm
b.
7000 nm
c.
4000 nm
d.
400 nm
e.
3sgc_exam_1_web_files/i0390000.jpg108 m
 

 37. 

The star Vega has an apparent visual magnitude of 0.03, and the star HR 4374 has an apparent visual magnitude of 4.87. It has been determined that both stars are at the same distance from Earth. What does this information tell us about the two stars?
a.
Vega must produce more energy than HR 4374.
b.
Vega must be farther from Earth than HR 4374.
c.
Vega must be closer to Earth than HR 4374.
d.
Vega will appear fainter to us than HR 4374.
e.
Vega must produce less energy than HR 4374.
 

 38. 

The sun is
a.
1 AU from Earth.
b.
a star.
c.
more than 100 times the diameter of Earth.
d.
all of the above.
e.
none of the above.
 

 39. 

How many centimeters are there in one kilometer
a.
100
b.
100,000
c.
1000
d.
1sgc_exam_1_web_files/i0420000.jpg106
e.
10,000
 

 40. 

Absolute zero is
a.
zero degrees Celsius.
b.
the temperature at which atoms have no remaining energy from which we can extract heat.
c.
the temperature at which water freezes.
d.
both a and c
e.
none of the above
 

 41. 

If the north celestial pole appears on your horizon, what is your latitude?
a.
90° S
b.
The latitude of the observer cannot be determined from the information given.
c.
d.
45° N
e.
90° N
 

 42. 

The Milky Way Galaxy
a.
contains about 100 billion stars.
b.
is about 100 light-years in diameter.
c.
is the largest known object in the universe.
d.
a., b., and c. are correct
e.
Only a. and c. are correct.
 

 43. 

64,200,000,000 is equal to
a.
6.42sgc_exam_1_web_files/i0460000.jpg1010.
b.
1.0sgc_exam_1_web_files/i0460001.jpg1064.2.
c.
6.42sgc_exam_1_web_files/i0460002.jpg10-10.
d.
6.42sgc_exam_1_web_files/i0460003.jpg10-7.
e.
6.42sgc_exam_1_web_files/i0460004.jpg107.
 

 44. 

What is the wavelength of the longest wavelength light visible to the human eye?
a.
3sgc_exam_1_web_files/i0470000.jpg108 m
b.
700 nm
c.
4000 nm
d.
7000 nm
e.
400 nm
 

 45. 

You live at a latitude of 73° N. What is the angle between the northern horizon and the north celestial pole?
a.
27°
b.
c.
17°
d.
73°
e.
231/2°
 

 46. 

The _______________ is the point on the celestial sphere directly above any observer.
a.
south celestial pole
b.
celestial equator
c.
north celestial pole
d.
zenith
e.
asterism
 

 47. 

The radiation emitted from a star has a maximum intensity at a wavelength of 500 nm. What is the temperature of this star?
a.
1.5sgc_exam_1_web_files/i0500000.jpg109 K
b.
10,000 K
c.
6,000 K
d.
5,000 K
e.
500 K
 

 48. 

Seen from the northern latitudes, the star Polaris
a.
always sets directly in the west.
b.
is always above the northern horizon.
c.
is never visible during the winter.
d.
is never above the horizon during the day.
e.
is the brightest star in the sky.
 

 49. 

The radiation emitted from a star has a maximum intensity at a wavelength of 300 nm. What is the temperature of this star?
a.
900,000,000 K
b.
10,000 K
c.
300 K
d.
100 K
e.
90,000 K
 

 50. 

A beam of light from a laser has a wavelength of 600 nm, what is the frequency of this light?
a.
2sgc_exam_1_web_files/i0530000.jpg10-15 Hz
b.
6000 Hz
c.
5sgc_exam_1_web_files/i0530001.jpg1014 Hz
d.
1.8sgc_exam_1_web_files/i0530002.jpg1012 Hz
e.
3sgc_exam_1_web_files/i0530003.jpg108 m/s
 



 
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