Section 13.D

Question 1

1. Realize the ________ that leads a neutron star to collapse to become a black hole is about 3  Msun

Answer 1

• critical mass

Question 2

Recognize the methods of making a black hole:

Agree that a black hole is what gets made by ___

Answer 2

(1) too much weight gain by a neutron star
(2) two neutron stars combine
(kilonova)
(3) hypernova death of a very massive star.

• these three processes.

Question 3

3. Pick the likely results of a hypernova (2 results)

Answer 3

• black hole is formed plus two gamma ray light beams are sent out

Question 4

Recognize characteristics of a black hole such as it being a region of ________. It can spin.

Answer 4

• force and very strongly warped space

Question 5

Among a list of possible characteristics, choose which do or do not apply to a black hole (6)

Answer 5

• a black hole as a magnetic field
• very strong gravity too
• warps space severely
• has mass/weight
• but has no solidness
• light cannot escape its gravity

Question 6

Match an event horizon with its description. What is it?

Answer 6

??

Question 7

What is the escape velocity needed for any object that is right at the edge of the black hole (at its event horizon).

Answer 7

??

Question 8

Given a list of choices, be able to pick a good method of detecting a black hole. Some were covered earlier as methods that can also be used to find a neutron star, but there’s one more covered later

Answer 8

??

Question 9

Realize that if a small black hole moves in front of star, it will make the star look brighter due to focusing the star’s light using _____

Answer 9

warped space that is around the black hole.

Question 10

Space can actually be dragged around the _____ of a black hole!

Answer 10

• edge