Hiding in Time Complete Test Bank Third Edition - Understanding Our Universe 3e Complete Test Bank by Stacy Palen. DOCX document preview.
Mission 15: Hiding in Time
MULTIPLE CHOICE
1. Which of the following facts about black holes is not true?
a. Nothing can escape from a black hole once it has crossed the event horizon.
b. There is a supermassive black hole at the center of most galaxies, including the Milky Way.
c. Low-mass black holes can form as the result of the deaths of massive stars.
d. Cygnus X-1 is an example of a nearby black hole.
e. The Sun will eventually turn into a black hole and suck in the Earth.
2. Which of the following is the best approximation of the Schwarzschild radius for a black hole with the mass of the Sun?
a. 0.001 m d. 100 km
b. 1 m e. 1,000 km
c. 1 km
3. Which of the following is the strongest piece of evidence that suggests a supermassive black hole exists at the center of the Milky Way?
a. Light from background stars is bent about the center of the galaxy, allowing astronomers to estimate the mass residing in the nucleus.
b. Astronomers use infrared observations of the motion of stars orbiting what appears to be empty space at center of the galaxy.
c. High-energy photons stream from a super-heated accretion disk of material orbiting the empty center of the galaxy.
d. Light echoes from shock waves associated with a massive explosion that formed the supermassive black hole have been observed.
e. none of the above
4. For an observer located deep in the curved space-time near a black hole, which two of the following phenomena are true?
a. The observer’s time passes more quickly.
b. The observer’s time passes more slowly.
c. Photons emitted by the observer are red-shifted as they move away from the black hole.
d. Photons emitted by the observer are blue-shifted as they move away from the black hole.
5. The theory of general relativity and its description of the warping of space and time by the presence of massive objects is an alternative description to Newton’s theory of gravity proposed by which of the following famous scientists?
a. Max Planck
b. Neil deGrasse Tyson
c. Galileo Galilei
d. Albert Einstein
e. Niels Bohr
1. The fear of black holes lurking in space waiting to swallow unsuspecting spaceships or whole planetary systems is a common theme in science fiction. This fear turns out to be mostly unjustified. Explain.
2. How do black holes produce high-energy radiation?