17.13 Seyfert Galaxies Quiz

What is a characteristic feature of Seyfert galaxies?

• They have a large, dim nucleus.

• They have a small, bright, point-like nucleus.

• They have no nucleus.

• They have a nucleus that does not change brightness.

What percentage of spiral galaxies are Seyfert galaxies?

• 10%

• 5%

• 2%

• 20%

What are the two types of Seyfert galaxies?

• Type A and Type B

• Seyfert 1 and Seyfert 2

• Type X and Type Y

• Seyfert Alpha and Seyfert Beta

Why must the nucleus of a Seyfert galaxy be small?

• Because it changes brightness very slowly

• Because it changes brightness very quickly

• Because it does not change brightness

• Because it is very dim

What is an active galaxy?

• A galaxy with no energy emission

• A galaxy whose center emits a large amount of energy

• A galaxy with no nucleus

• A galaxy that is not visible

What analogy is used to explain the brightness change in Seyfert galaxies?

• A small room with a light switch

• A very large room with a light switch

• A dark room with no light

• A room with no switch

Tags

NGSS.5-ESS1-1

How does the nucleus of a Seyfert galaxy behave at X-ray wavelengths?

• It remains constant

• It fluctuates in brightness

• It disappears

• It becomes dimmer

Tags

NGSS.HS-PS4-4

What is the relationship between the size of a room and the time it takes to change brightness, according to the analogy?

• Larger rooms take less time

• Larger rooms take more time

• Size does not affect time

• Smaller rooms take more time

What is the main focus of the lesson described in the document?

• Elliptical and lenticular galaxies

• Seyfert and double-lobed radio galaxies

• Spiral and irregular galaxies

• Dwarf and giant galaxies

What is synchrotron radiation?

• Radiation from nuclear reactions

• Electromagnetic radiation emitted by energetic electrons

• Light emitted by stars

• Heat radiation from black holes

Tags

NGSS.HS-PS4-3