Question

In: Physics

Two stars, A & B, have same color. This implies that a. Both stars emit same...

Two stars, A & B, have same color. This implies that
a. Both stars emit same amount of light.
b. Both stars located at equal distance from the earth.
c. Both stars has the same temperature.
d. None of the above
2. The horizontal axis of H-R diagram plots
a. mass b. Luminosity c. apparent brightness d. temperature
3. Most stars (when plotted on a H-R diagram) would fall into a region called
a. red giant b. main sequence c. blue giant d. white dwarf
4. White dwarfs compare to main sequence class O stars are
a. larger b. younger c. smaller d. same size
5. Astronomers identify the stars on the upper right hand corner of H-R diagram as
a. very hot stars b. Blue giant stars c. Red giants d. yellow giants
6. Stars that lie in different places on the main sequence of the H-R diagram different
from each other mainly having different
a. Composition b. apparent brightness c. way that they formed d. mass
7. What type of main sequence stars expects to live longest?
a) O b) M c) F d) G
10. Luminosity of a star depends on
a. distance and temperature
b. brightness and distance
c. size and distance d) size and temperature

11. Apparent brightness of a star depends on
a. temperature and distance
b. size and distance
c. distance only
d. distance and luminosity
12. If parallax of a star is 0.5 arc sec, its distance is
a. 0.5 ly b. 0.5 pc c. 2 pc d. 2 ly

13-16 Refer the H-R diagram below

13. Consider stars a, b, and c. Which star has the greatest mass?
a b c
14. Consider stars a, b, and c. Which star has the longest life time?
a b c

15. Consider stars c and e, which star is larger?
(a) c (b) e (c) both c and e has same size (d) not enough information
16. Consider stars “a” and “e” , they both have same

(a) Size (b) Luminosity (c) brightness (d) temperature

17. The total amount of energy a star gives off each second is its
a. temperature b. apparent magnitude c. brightness d. luminosity
18. What is the spectral class of the Sun?
a) A b) B c) M d) G
19. The name of the star that appears brightest in the night sky is
a) Vega b) North star c) Sun d) Sirius
20. A star has apparent brightens 3 and absolute brightness 1. The distance to this star
from the earth is

a. 3 light years b. less than 10 pc c. more than 10 pc d. 100 l.y

Use the information in following table to answer questions 21-28
Name Apparent
brightness- m

Absolute
brightness M

Spectral class Distance l.y
Alderbaran 1 1.5 M 345
Arcturus 0.1 -0.6 K 182
Capella 0.4 -4 G 280
Ross 3.4 13 B 38
Cygni 18 7 M 54
Procyon 0 3.7 A 600
Eridani 5 4 K 480
21. What is the hottest star?
a. Capella b, Cygni c. Alderbaran d, Procyon
22. Which star has largest parallax angle?
a. Cygni b. Alderbaran c. Ross d. Procyon
23. Which star has the greatest luminosity?
a. Capella b, Eridini c. Alderbaran d, Ross
24. Which star appears red?
a. Arcturus b, Eridini c. Cygni d, Ross
25. Which star is not visible to naked eye?
a. Capella b, Cygni c. Sirius d, Ross
26. Compare Arcturus and Eridani, Which star is bigger
a. arcturus b. Eridani c. both stars have same size
27. Star A has apparent brightness 2 and star B has apparent brightness 8. Which star
appears brighter in the sky?
a) B b) A c) cannot tell without the distance
28. Sun is known as a normal star, but it appears very bright because
a. it has very large luminosity
b. its core temperature is very high compared to all other stars
c. It is much bigger than all other stars
d. It is very close to the earth.
29. Two stars, A & B, belong to same spectral class and same size. But A is closer to
us than B. Which star has greater “m” value?
(a) A ( b) B (c) both stars have same m value (d) cannot answer without M
30. Stars A and B have the same luminosity. Star A has apparent magnitude 1 and star
B has apparent magnitude 6 . Which star is closer?
(a) A ( b) B (c) distance is same for both stars (d) cannot answer without
knowing temperature

Solutions

Expert Solution

1. Two stars, A & B, have same color. This implies that
b. Both stars located at equal distance from the earth.


2. The horizontal axis of H-R diagram plots

d. temperature

3. Most stars (when plotted on a H-R diagram) would fall into a region called
b. main sequence


4. White dwarfs compare to main sequence class O stars are
c. smaller


5. Astronomers identify the stars on the upper right hand corner of H-R diagram as
c. Red giants


6. Stars that lie in different places on the main sequence of the H-R diagram different from each other mainly having different
d. mass


7. What type of main sequence stars expects to live longest?
b) M (About 76% of the main sequence stars are class M stars)


10. Luminosity of a star depends on
d) size and temperature (Because luminosity of a star depends on both radius of the star and its tempearture)

11. Apparent brightness of a star depends on
c. distance only (Apparent brightness depends on the composition of the star and its distance from the planet)

12. If parallax of a star is 0.5 arc sec, its distance is


c. 2 pc

Questions 13-16 requires the diagram.

19. The name of the star that appears brightest in the night sky is
d) Sirius
20. A star has apparent brightens 3 and absolute brightness 1. The distance to this star from the earth is

c. more than 10 pc

Use the information in following table to answer questions 21-28
Name Apparent brightness- m

Absolute brightness M

Spectral class Distance l.y
Alderbaran 1 1.5 M 345
Arcturus 0.1 -0.6 K 182
Capella 0.4 -4 G 280
Ross 3.4 13 B 38
Cygni 18 7 M 54
Procyon 0 3.7 A 600
Eridani 5 4 K 480
21. What is the hottest star?
b, Cygni - because it is close to earth.

22. Which star has largest parallax angle?
d. Procyon
23. Which star has the greatest luminosity?
a. Capella b, Eridini c. Alderbaran d, Ross
24. Which star appears red?
a. Arcturus

Because it belongs to spectral class K

25. Which star is not visible to naked eye?
d, Ross
26. Compare Arcturus and Eridani, Which star is bigger
a. arcturus
27. Star A has apparent brightness 2 and star B has apparent brightness 8. Which star
appears brighter in the sky?
b) A c) cannot tell without the distance
28. Sun is known as a normal star, but it appears very bright because

d. It is very close to the earth.

genius_generous answered 7 months ago
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