For a wave on the ocean, the amplitude is:
a. the distance between crests.
b. the height difference between a crest and a trough.
c. one half the height difference between a crest and a trough.
d. how far the wave goes up on the beach.
C
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Pulsars are thought to be ________
A) unstable high-mass stars B) accreting black holes C) rapidly rotating neutron stars D) accreting white dwarfs
If two stars are emitting the same amount of light, the star that is farther will appear
a. brighter. b. dimmer. c. redder. d. bluer. e. They will have the same brightness as seen from Earth.
A(n) ______ is a single point in an electronic image.
A. serif B. simbit C. pixel D. pica
Dark matter is made of
A) slow-moving "magnetons" that were created during the big bang. B) fast moving "gluons" that were created during the big bang. C) Both of the above. D) an unknown material that has never been directly observed in laboratories. E) soap bubbles.