Giant Stars and Helium Fusion

What is the primary process generating energy in a main sequence star like our sun?

• Helium fusion

• Hydrogen fusion

• Carbon fusion

• Oxygen fusion

Tags

NGSS.HS-ESS1-1

What happens to a star's core when it runs out of hydrogen fuel?

• It expands and cools down

• It contracts and heats up

• It remains the same

• It explodes

Tags

NGSS.HS-ESS1-1

What is the term used to describe the process of three helium atoms forming carbon?

• Alpha decay

• Triple alpha process

• Beta decay

• Gamma process

Tags

NGSS.HS-ESS1-1

NGSS.HS-ESS1-3

NGSS.HS-PS1-8

What is the approximate temperature required for helium fusion to begin in a star's core?

• 10 million Kelvin

• 50 million Kelvin

• 100 million Kelvin

• 200 million Kelvin

Tags

NGSS.HS-ESS1-1

As a star becomes a giant, what happens to its density and temperature?

• Density increases, temperature increases

• Density decreases, temperature decreases

• Density increases, temperature decreases

• Density decreases, temperature increases

What is the main reason a star like our sun will eventually become a giant star?

• It will gain mass from nearby stars

• It will run out of hydrogen fuel in its core

• It will collide with another star

• It will lose its outer layers

What is the "helium flash" in the context of giant stars?

• The explosion of a star

• The ignition of helium fusion in the core

• The cooling of the star's surface

• The expansion of the star's outer layers

What happens to the luminosity of a star as it becomes a giant?

• It decreases

• It remains the same

• It increases

• It fluctuates

What is the "hydrogen shell" in a giant star?

• A layer of hydrogen fusing outside the helium core

• A protective layer around the star

• A region where helium is being fused

• A layer of hydrogen that is not involved in fusion

What is left behind in the core of a star after hydrogen fusion has occurred?

• Carbon ash

• Helium ash

• Oxygen ash

• Nitrogen ash

Tags

NGSS.HS-ESS1-1