The Sun's evolution from youngest to oldest stage is
A. protostar, red giant, main sequence, white dwarf.
B. white dwarf, red giant, main sequence, protostar.
C. protostar, main sequence, red giant, white dwarf.
D. red giant, main sequence, white dwarf, protostar.
Answer: C
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If you were all powerful, how could you make the difference between a planet's night and day temperatures larger?
A) Increase the greenhouse gas content of the planet's atmosphere. B) Increase the tilt of the planet's rotation axis. C) Make the planet rotate more slowly. D) Increase the number of impact craters on the planet.
The unit of inductance, the henry, is equivalent to:
a. J/C. c. V•s/A. b. V/m. d. none of the units given.
Everything looks red through a red filter because
A) the filter transmits red light and absorbs other colors. B) the filter reflects red light and transmits other colors. C) the filter emits red light and absorbs other colors. D) the filter absorbs red light and emits other colors.
Why is iron significant to understanding how a supernova occurs?
A) Iron cannot release energy either by fission or fusion. B) Iron is the heaviest of all atomic nuclei, and thus no heavier elements can be made. C) Supernovae often leave behind neutron stars, which are made mostly of iron. D) The fusion of iron into uranium is the reaction that drives a supernova explosion.