Why are rapid fluctuations in an active galaxy's luminosity evidence for a supermassive black hole?
What will be an ideal response?
Rapid fluctuations must come from a very small source. The only object that can be luminous and massive enough within the small spaces implied is a black hole.
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The lamps in a string of Christmas tree lights are connected in parallel. What happens if one lamp burns out? (Assume negligible resistance in the wires leading to the lamps.)
A) The brightness of the lamps will not change appreciably. B) The other lamps get dimmer equally. C) The other lamps get brighter equally. D) The other lamps get brighter, but some get brighter than others. E) The other lamps get dimmer, but some get dimmer than others.
Which of the following is a megawatt?
A) 109W B) 106W C) 1000 W D) 10-9W E) 10-6W
The Sun creates its energy by the process of
a. nuclear fission. b. nuclear fusion. c. convection. d. conduction. e. radiation.
The daytime surface temperature of Mercury is higher than Earth's Moon's surface temperature because
a. clouds shield the Earth's Moon during the day. b. Mercury is farther from the Sun than the Earth's Moon. c. Mercury is closer to the Sun than the Earth's Moon. d. the atmosphere of the Earth's Moon has a strong greenhouse effect.