Exam 15: Black Holes: Matters of Gravity

Gas can be pulled off a binary companion by a black hole. The black hole's event horizon is too small to allow all the gas to enter perpendicularly, so it orbits in a ring around the black hole or a neutron star. What is this ring called?

(Multiple Choice)

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Question 41

Which one of these statements about the evaporation of black holes is correct?

(Multiple Choice)

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Question 42

If a person falls as far as the event horizon of a black hole, what would happen to the person's heart rate, as perceived by a distant observer (apart from the effects caused by the person's adrenaline level)?

(Multiple Choice)

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Question 43

At what location in the space around a black hole does the escape velocity become equal to the speed of light?

(Multiple Choice)

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Question 44

In the context of black holes, the word "ergosphere" names the

(Multiple Choice)

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Question 45

If an observer sees an object moving past them at 90% of the speed of light, what will its length appear to be?

(Multiple Choice)

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Question 46

What is the Schwarzschild radius of a black hole?

(Multiple Choice)

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Question 47

What name is given to a nonrotating black hole?

(Multiple Choice)

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Question 48

Where should an astronomer look for an event horizon?

(Multiple Choice)

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Question 49

What name is given to a rotating black hole?

(Multiple Choice)

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Question 50

The escape velocity for material inside a black hole is

(Multiple Choice)

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Question 51

How must an object be moving for one to be able to use the theory of special relativity to describe the object?

(Multiple Choice)

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Question 52

Suppose that a neutron star of 2.9 solar masses is part of a binary star system in which the other star is a normal giant star. What would happen if 1 solar mass of material were transferred onto the neutron star from its companion?

(Multiple Choice)

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Question 53

What property of the longer-living gamma-ray bursts indicates that they are located at large ("cosmological") distances from Earth?

(Multiple Choice)

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Question 54

In principle, if astronomers were in the vicinity of a Schwarzschild black hole, how could they measure its mass?

(Multiple Choice)

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Question 55

Place two identical 3-solar-mass black holes side by side. Add 1 solar mass of neutrons to the left-hand one and 1 solar mass of protons to the right-hand one. How will these two black holes differ?

(Multiple Choice)

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Question 56

Which of these has been associated with a magnetar?

(Multiple Choice)

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Question 57

Primordial black holes can have masses from a few grams to the mass of a planet. What would be the radius of a primordial black hole with a mass of 10 grams?

(Multiple Choice)

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Question 58

In the language of general relativity, what is usually called "gravitational force" is described in terms of

(Multiple Choice)

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Question 59

What property of matter does general relativity address that is NOT included in special relativity?

(Multiple Choice)

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Question 60

Showing 41 - 60 of 178

Gas can be pulled off a binary companion by a black hole. The black hole's event horizon is too small to allow all the gas to enter perpendicularly, so it orbits in a ring around the black hole or a neutron star. What is this ring called?

Which one of these statements about the evaporation of black holes is correct?

If a person falls as far as the event horizon of a black hole, what would happen to the person's heart rate, as perceived by a distant observer (apart from the effects caused by the person's adrenaline level)?

At what location in the space around a black hole does the escape velocity become equal to the speed of light?

In the context of black holes, the word "ergosphere" names the

If an observer sees an object moving past them at 90% of the speed of light, what will its length appear to be?

What is the Schwarzschild radius of a black hole?

What name is given to a nonrotating black hole?

Where should an astronomer look for an event horizon?

What name is given to a rotating black hole?

The escape velocity for material inside a black hole is

How must an object be moving for one to be able to use the theory of special relativity to describe the object?

Suppose that a neutron star of 2.9 solar masses is part of a binary star system in which the other star is a normal giant star. What would happen if 1 solar mass of material were transferred onto the neutron star from its companion?

What property of the longer-living gamma-ray bursts indicates that they are located at large ("cosmological") distances from Earth?

In principle, if astronomers were in the vicinity of a Schwarzschild black hole, how could they measure its mass?

Place two identical 3-solar-mass black holes side by side. Add 1 solar mass of neutrons to the left-hand one and 1 solar mass of protons to the right-hand one. How will these two black holes differ?

Which of these has been associated with a magnetar?

Primordial black holes can have masses from a few grams to the mass of a planet. What would be the radius of a primordial black hole with a mass of 10 grams?

In the language of general relativity, what is usually called "gravitational force" is described in terms of

What property of matter does general relativity address that is NOT included in special relativity?

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