Although theory says a massive black hole with an accretion disk should be emitting X-rays, many black holes emit
A) mainly in the gamma.
B) virtually no radiation at all.
C) only in the visible.
D) equally across the entire electromagnetic spectrum.
E) mostly in the infrared.
E
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List the terrestrial planets in decreasing order of their mass.
A. Venus, Earth, Mars, Mercury B. Mercury, Venus, Earth, Mars C. Mercury, Mars, Venus, Earth D. Earth, Venus, Mars, Mercury
The photosphere
A. is the hottest part of the Sun. B. is the layer of the Sun where it transitions from being opaque to transparent. C. is the densest part of the Sun. D. is the part of the Sun where nuclear fusion is occurring.
A body is oscillating up and down at the end of a spring. Let's consider when the body is at the top of its up-and-down motion.The displacement vector from the equilibrium position has its largest magnitude
a. True b. False Indicate whether the statement is true or false
The visual pink glow of the Great Nebula in Orion
a. is a Herbig-Haro object. b. is a reflection nebula of dust. c. is an emission nebula of thin gas. d. contains only young low mass stars. e. is believed to be about 5 billion years old.