Quiz 2 study questions

Question 1

hyper nova is a GammaRay bursts source that is thought to correspond to the formation of a black hole with very focused bipolar Jets true or false

Answer 1

True

Question 2

The escape speed for a black holes event horizon is the speed of light True or false?

Answer 2

True

Question 3

The key to identifying a black hole Candidate in a binary system is to find an unseen compact companion that has a mass greater than the limiting mass of a neutron star true or false

Answer 3

True

Question 4

The shcwarzshild of a black hole depends on its what?

Answer 4

Mass

Question 5

When a star like the supergiant in the x-ray binary Cygnus x-1 fills its critical gravitationally bound surface. It will have the shape of a

Answer 5

Egg

Question 6

What is a neutron stars limiting mass

Answer 6

3 solar masses

Question 7

The black hole in Cygnus x-1 has a mass of_solar masses

Answer 7

15

Question 8

Stars with a mass below 8% of the Suns of mass are called

Answer 8

Brown dwarfs

Question 9

Stars with a mass below 8% slowly fade away because their cores are not hot enough to burn what element

Answer 9

Hydrogen

Question 10

As stars Age their cores contract in their outer envelopes expands true or false

Answer 10

True

Question 11

Following the completion of core hydrogen burning what would the sun turn into next

Answer 11

Red giant

Question 12

What two elements do stars like the sun fuse together

Answer 12

He into carbon

Question 13

A star like the sun will spend most of its nuclear life as a?

Answer 13

Main sequence star

Question 14

The larger the stellar mass the longer the lifetime of the star true or false

Answer 14

False

Question 15

Stars like the sun will shine by nuclear reactions for_years

Answer 15

10 billion

Question 16

Evolution is different and close binary stars because stars can exchange some of their mass true or false

Answer 16

True

Question 17

The sudden collapse of the iron core of a star into a compact ball of neutrons leads to a?

Answer 17

Supernova explosion

Question 18

What is the upper limit for the mass of the white dwarf

Answer 18

1.4 solar masses

Question 19

Type one nova always occur in a close binary system true or false

Answer 19

True

Question 20

What is the likely progenitor of a type one supernova

Answer 20

A mass transfer binary

Question 21

Stars form in dark clouds of dust and gas the gas between those stars is called?

Answer 21

Interstellar medium

Question 22

What is interstellar medium

Answer 22

Gas between stars

Question 23

What is a dark nebula

Answer 23

A cloud that obscures our view

Question 24

What effect does interstellar dust have on stars

Answer 24

Makes them appear fainter and redder

Question 25

True or false gravity can create stars if it can overcome the force of thermal pressure?

Answer 25

True

Question 26

What would happen to a contracting cloud fragment if it were not able to radiate away it's thermal energy?

Answer 26

Internal pressure would increase

Question 27

A protostar becomes a main sequence star once the core becomes hot enough for nuclear fusion. True or false

Answer 27

True

Question 28

Starlike objects massive enough to start fusion are called what

Answer 28

Brown dwarfs

Question 29

In the mirror principle a core contracts because?

Answer 29

Pressure decreases when hydrogen is too low for fusion

Question 30

When do subgiants become Giants?

Answer 30

When hydrogen is burning around a inert helium core. (Mirror principle)

Question 31

When does the mirror principle begin

Answer 31

When most of hydrogen burning has ended

Question 32

After hydrogen burns out what type of fusion begins to occur

Answer 32

Helium fusion

Question 33

Hydrogen turns to helium and helium turns into what.

Answer 33

Carbon

Question 34

After a multiple shell burning where many elements fuse in a shell the core of a star collapses and what happens?

Answer 34

A supernova explosion that leaves a neutron star or black hole

Question 35

What is the white dwarf

Answer 35

The dead core of a star

Question 36

A type 2 supernova is

Answer 36

The death or explosion of a massive star

Question 37

A type one nova is

Answer 37

The explosion of WD which is half the size of earth in a binary

Question 38

A neutron star is left behind by what

Answer 38

A massive star supernova or type 2

Question 39

What is the radius of a neutron star

Answer 39

10 km or 6 miles

Question 40

True or false all pulsars are neutron stars but not all neutron stars are pulsars

Answer 40

True

Question 41

A GammaRay happens when two neutron stars merge or

Answer 41

A hyper nova occurs

Question 42

When a star fills it's critically gravitationally bound surface it begins to retain the shape of

Answer 42

An egg