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Other Sciences, Science
9th -
12thgrade
Crash Course - #33 Black Holes
20 questions
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- 1. Multiple ChoiceIf a dying star's core is less than 1.4 times the mass of the Sun, it becomes ___a white dwarfa neutron stara red gianta black hole
- 2. Multiple ChoiceIf a dying star's core is between 1.4 and 2.8 times the Sun's mass, it becomes ___a white dwarfa neutron stara red gianta black hole
- 3. Multiple ChoiceIf a dying star's core is more than 2.8 times the Sun's mass, it becomes ___a white dwarfa neutron stara black gianta black hole
- 4. Multiple ChoiceFor Earth, the escape velocity is about ___11 km per hour11 km per second600 km per hour600 km per second
- 5. Multiple ChoiceA neutron star, with its immense gravity, can have an escape velocity that's up to ___one quarter of the speed of lighthalf the speed of lightthe speed of lighttwice the speed of light
- 6. Multiple ChoiceNothing can escape, not even light, once the core of a neutron star shrinks down to ___roughly 1.8 kmroughly 8.1 kmroughly 18 kmroughly 81 km
- 7. Multiple ChoiceThe surface around a black hole, where the escape velocity is the speed of light, is called ___the observable boundarythe event horizonthe progenitor surfaceThe Chandrasekhar Limit
- 8. Multiple ChoiceTo become a black hole, the original star must have a mass of ___more than 1/4 of the Sun's massmore than 1.4 times the Sun's massmore than 4 times the Sun's massmore than 20 times the Sun's mass
- 9. Multiple ChoiceIf you could turn the Sun into a black hole, then the Earth would ___quickly get pulled inorbit it slower than it does noworbit it pretty much exactly as it does noworbit it faster than it does now
- 10. Multiple ChoiceThe strength of gravity you feel from an object depends on ___how large it is and your distance from its centerhow massive it is and your distance from its centerhow large it is and its densityhow massive and dense it is
- 11. Multiple ChoiceBlack holes with masses ranging from about 3 to a few dozen solar masses are called ___dwarf black holesmini black holesstellar-mass black holesgray holes
- 12. Multiple ChoiceThe black hole at the center of our own Milky Way galaxy has a mass of ___4.3 times the Sun's mass430 million times the Sun's mass4,300 times the Sun's mass4.3 million times the Sun's mass
- 13. Multiple ChoiceThe vertical stretching of an object, as it falls into a black hole, is called ___fettuccinationthe linguine effectspaghettificationthe noodle response
- 14. Multiple ChoiceWhat we perceive as gravity is really just ___a dent in reality-fabrica warping of space-timea bump in the stellar-textilea bending of the event horizon
- 15. Multiple ChoiceDue to gravity, your clock ticks a bit slower than for someone ___in a deep minenear a neutron starfar away from planets and starsnear a black hole
- 16. Multiple ChoiceAt the event horizon of a black hole, time ___slows to a crawlessentially stopsspeeds upreverses
- 17. Multiple ChoiceWhen you're at the event horizon, an outside observer would see the light coming from you ___infinitely blue-shiftslightly blue-shiftslightly red-shiftinfinitely red-shift
- 18. Multiple ChoiceFrom your viewpoint, as you fall into a black hole, you'd see the universe ___slow down, and the light from it blue-shiftspeed up, and the light from it blue-shiftslow down, and the light from it red-shiftspeed up, and the light from it red-shift
- 19. Multiple ChoiceThe math and physics to explain black holes is ___fairly easy to understanduncomplicatedslightly complicatedfiercely complicated
- 20. Multiple ChoiceBlack holes come in different sizes, but for all of them, the escape velocity is ___a fraction of the speed of lightnearing the speed of lightat the speed of lightgreater than the speed of light
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