Exam 21: Stellar Remnants: Neutron Stars and Black Holes

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How does the attractive force you feel compare if you are just outside the event horizon of a massive black hole or of a relatively small black hole?

(Multiple Choice)

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Question 21

In the event observed by LIGO on September 14, 2015, two black holes with a combined mass of 65 M_ε merged to form a black hole with 63 M_ε. What happened to the difference in mass?

(Multiple Choice)

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Question 22

In what way is the general theory of relativity more general (deals with more situations) than the special theory?

(Multiple Choice)

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Question 23

The discovery of the Crab Pulsar, with a period of only 1/30 s, ruled out a number of possible explanations for pulsars. These included all of the following EXCEPT ONE. Which one was the exception?

(Multiple Choice)

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Question 24

Why is the orbit of Mercury important from the standpoint of general relativity?

(Multiple Choice)

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Question 25

How does a gravitational field affect the passage of time?

(Multiple Choice)

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Question 26

It is theoretically possible for a rotating black hole to transfer energy to the accretion disk surrounding it. The mechanism through which the energy is transferred is:

(Multiple Choice)

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Question 27

If the Schwarzschild radius of a 2-M_ε black hole is 6 km, what is it for a 5-M_ε black hole?

(Multiple Choice)

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Question 28

A typical galaxy has a mass of 10¹¹ M_ε. If 1% of this mass collects at the center of the galaxy to become a nonrotating black hole, what will be its Schwarzschild radius?

(Multiple Choice)

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Question 29

Tidal forces distort objects near black holes. These tidal forces:

(Multiple Choice)

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Question 30

The escape velocity of matter from the center of a black hole whose mass is 3 M_ε is:

(Multiple Choice)

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Question 31

What is the Schwarzschild radius of a black hole that is 2 M_ε?

(Multiple Choice)

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Question 32

All black hole candidates observed so far are:

(Multiple Choice)

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Question 33

What is believed to be the maximum mass for a neutron star?

(Multiple Choice)

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Question 34

The black hole at the center of the Milky Way Galaxy is estimated to have a mass of roughly 4 million M_ε. What is the TEMPERATURE of this black hole (that is, the temperature of a blackbody with an equivalent energy emission)?

(Multiple Choice)

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Question 35

The age of the universe is roughly 14 billion years, which is also the approximate evaporation time for a black hole with a mass of 10¹⁰ kg. What is the Schwarzschild radius of such a black hole?

(Multiple Choice)

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Question 36

The escape speed from a neutron star is:

(Multiple Choice)

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Question 37

In the Penrose process it is theoretically possible to:

(Multiple Choice)

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Question 38

Take two identical, nonrotating, 5-M_? black holes and place them side by side. Add 1 M_? of pineapples to the left-hand one and 1 M ? of radioactive uranium to the right-hand one (without changing their electric charge or their rotation). Afterward, how do these two black holes differ?

(Multiple Choice)

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Question 39

How do rotating black holes differ from nonrotating black holes?

(Multiple Choice)

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Question 40

Showing 21 - 40 of 107

Exam 21: Stellar Remnants: Neutron Stars and Black Holes

How does the attractive force you feel compare if you are just outside the event horizon of a massive black hole or of a relatively small black hole?

In the event observed by LIGO on September 14, 2015, two black holes with a combined mass of 65 Mε merged to form a black hole with 63 Mε. What happened to the difference in mass?

In what way is the general theory of relativity more general (deals with more situations) than the special theory?

The discovery of the Crab Pulsar, with a period of only 1/30 s, ruled out a number of possible explanations for pulsars. These included all of the following EXCEPT ONE. Which one was the exception?

Why is the orbit of Mercury important from the standpoint of general relativity?

How does a gravitational field affect the passage of time?

It is theoretically possible for a rotating black hole to transfer energy to the accretion disk surrounding it. The mechanism through which the energy is transferred is:

If the Schwarzschild radius of a 2-Mε black hole is 6 km, what is it for a 5-Mε black hole?

A typical galaxy has a mass of 1011 Mε. If 1% of this mass collects at the center of the galaxy to become a nonrotating black hole, what will be its Schwarzschild radius?

Tidal forces distort objects near black holes. These tidal forces:

The escape velocity of matter from the center of a black hole whose mass is 3 Mε is:

What is the Schwarzschild radius of a black hole that is 2 Mε?

All black hole candidates observed so far are:

What is believed to be the maximum mass for a neutron star?

The black hole at the center of the Milky Way Galaxy is estimated to have a mass of roughly 4 million Mε. What is the TEMPERATURE of this black hole (that is, the temperature of a blackbody with an equivalent energy emission)?

The age of the universe is roughly 14 billion years, which is also the approximate evaporation time for a black hole with a mass of 1010 kg. What is the Schwarzschild radius of such a black hole?

The escape speed from a neutron star is:

In the Penrose process it is theoretically possible to:

Take two identical, nonrotating, 5-M? black holes and place them side by side. Add 1 M? of pineapples to the left-hand one and 1 M ? of radioactive uranium to the right-hand one (without changing their electric charge or their rotation). Afterward, how do these two black holes differ?

How do rotating black holes differ from nonrotating black holes?

Astronomy and the Universe

Knowing the Heavens

Eclipses and the Motion of the Moon

Gravitation and the Waltz of the Planets

The Nature of Light

Optics and Telescopes

Comparative Planetology I: Our Solar System

Comparative Planetology II: the Origin of Our Solar System

The Living Earth

Our Barren Moon

Mercury, Venus, and Mars: Terrestrial, yet Unique

Jupiter and Saturn: Lords of the Planets

Jupiter and Saturns Satellites of Fire and Ice

Uranus, Neptune, Pluto, and the Kuiper Belt: Remote Worlds

Asteroids, Comets, and Impacts

Our Star, the Sun

The Nature of the Stars

The Birth of Stars

Stellar Evolution: on and After the Main Sequence

Stellar Evolution: The Death of Stars

Our Galaxy

Galaxies

Quasars and Active Galaxies

Cosmology: The Origin and Evolution of the Universe

Exploring the Early Universe

The Search for Extraterrestrial Life

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In the event observed by LIGO on September 14, 2015, two black holes with a combined mass of 65 M_ε merged to form a black hole with 63 M_ε. What happened to the difference in mass?

If the Schwarzschild radius of a 2-M_ε black hole is 6 km, what is it for a 5-M_ε black hole?

A typical galaxy has a mass of 10¹¹ M_ε. If 1% of this mass collects at the center of the galaxy to become a nonrotating black hole, what will be its Schwarzschild radius?

The escape velocity of matter from the center of a black hole whose mass is 3 M_ε is:

What is the Schwarzschild radius of a black hole that is 2 M_ε?

The black hole at the center of the Milky Way Galaxy is estimated to have a mass of roughly 4 million M_ε. What is the TEMPERATURE of this black hole (that is, the temperature of a blackbody with an equivalent energy emission)?

The age of the universe is roughly 14 billion years, which is also the approximate evaporation time for a black hole with a mass of 10¹⁰ kg. What is the Schwarzschild radius of such a black hole?

Take two identical, nonrotating, 5-M_? black holes and place them side by side. Add 1 M_? of pineapples to the left-hand one and 1 M ? of radioactive uranium to the right-hand one (without changing their electric charge or their rotation). Afterward, how do these two black holes differ?