Astronomy 100 Final Study Guide

About 90 percent of stars on the H-R diagram are ____ stars.

• red giant

• main sequence

• white dwarf

• supergiant

If a star is found directly to the right of the Sun on the H-R diagram, what can you conclude about its temperature?

• It is exactly the same temperature as the Sun.

• You would need to know if it was on the main sequence to answer this question.

• It is cooler than the Sun.

• It is hotter than the Sun.

The sun rotates once every 25 days relative to the stars. The Sun rotates once every 27 days relative to Earth. Why are these two numbers different?

• a. Earth moves in its orbit during this time.

• b. Earth is smaller.

• c. The stars are farther away.

• d. The sun moves relative to the stars.

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-4

The energy that is emitted from the Sun is produced

• at the top of the convective zone.

• at the surface.

• at the interface between the chromosphere and the photosphere.

• in the core, by nuclear fusion.

Tags

NGSS.HS-ESS1-1

The order of colors by wavelength from longest to shortest is

• red, orange, yellow, green, blue, violet

• violet, blue, green, yellow, orange red

• red, blue, yellow, green, orange, violet

• violet, orange, green, yellow, blue, red

Tags

NGSS.HS-PS4-1

Star A is a red and Star B is blue. They have equal luminosities, but Star A is twice as far away as Star B. Which is hotter?

• Star A

• Star B

Star A is a blue and Star B is red. They have equal luminosities, but Star A is twice as far away as Star B. Which star is larger?

• Star B

• Star A

Sunspots peak every ____ years, a consequence of the ____ year magnetic solar cycle.

• 5.5; 11
• 11; 22
• 22; 11

• 22; 44

The evolution of a star is primarily determined by its

• Composition

• Mass

• Density

• Neighbors or lack of them

Tags

NGSS.HS-ESS1-1

Some engineers and physicists have been working to solve the world’s energy supply problem by constructing power plants that would convert hydrogen to helium. Our sun seems to have solved this problem. On Earth, what is major obstacle to this solution?

• It is difficult to achieve the temperatures and pressures of the interior of the Sun.

• There is not enough hydrogen.

• All the hydrogen is locked up in water already.

• The helium shortage is driving up prices.

Tags

NGSS.HS-ESS1-1