Question

ssa - style assessment items
directions: choose the letter of the one most correct answer.
date: 09/23/15 period 6/6

1. the observed brightness of a star most depends on which factors?

a. the stars brightness
b. the stars distance, size, and size
c. the stars temperature, size, and distance
d. the stars composition, shape, and temperature

1. which factor is not used to determine a stars apparent magnitude?

a. size of the star
b. density of the star
c. temperature of the star
d. distance from the earth of the star

1. the surface temperature of a star is indicated by which characteristic?

a. absolute brightness
b. color
c. shape
d. size

1. the stars, rigel and betelgeuse, are both found in the constellation, orion. rigel is a blue supergiant and betelgeuse is a red supergiant. which of the following correctly compares the temperatures of rigel and betelgeuse?

a. rigel is hotter than betelgeuse, because blue stars are hotter than red stars.
b. betelgeuse is hotter than rigel, because red stars are hotter than blue stars.
c. rigel and betelgeuse are close to the same temperature, because they are both super - giants.
d. betelgeuse and rigel are close to the same temperature, because they are about the same distance from the sun.

1. brandon learns that a stars absolute brightness is determined by a combination of the stars physical properties. which of the following correctly describes the relationship between the absolute brightness of two stars that have the same radius?

a. the star that is hotter will have a lower absolute brightness.
b. the star that is hotter will have a higher absolute brightness.
c. the stars absolute brightness will depend on how close they are to the sun.
d. the stars will have the same absolute brightness since their radii are the same.

1. summarize the physical properties used for classifying stars.

Explanation:

1. The brightness of a star depends on its composition, size, and distance.
2. Distance from Earth is not used to determine a star's apparent magnitude among the given options as it is about the star's own - characteristics.
3. The surface temperature of a star is indicated by its color.
4. Blue stars are hotter than red stars, so Rigel is hotter than Betelgeuse.
5. For stars with the same radius, the hotter star will have a higher absolute brightness.
6. Stars are classified based on properties like brightness (apparent and absolute), size, temperature, color, and composition.

Answer:

1. C. the star's composition, size, and distance
2. A. size of the star
3. B. color
4. A. Rigel is hotter than Betelgeuse, because blue stars are hotter than red stars.
5. B. The star that is hotter will have a higher absolute brightness.
6. Stars are classified based on brightness (apparent and absolute), size, temperature, color, and composition.