Magenta, yellow, and cyan are the colors used in ________ color mixing.
What will be an ideal response?
subtractive
print
printing
pigment
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The period and the frequency of a sound wave are
A. multiples of each other-period is 2? times the frequency. B. independent of each other. C. reciprocals of each other. D. None of these choices are correct
The sketch shows groups of stars on the H-R diagram, labeled (a) through (e); note that (a) represents the entire main sequence, while (c) and (d) represent only small parts of the main sequence. Which group represents stars of the largest radii?
A) a B) b C) c D) d E) e
What happens to the visible radiation produced by new stars within a molecular cloud?
A) It escapes the cloud completely. B) It is absorbed by dust grains and heats up the cloud. C) It is reflected back onto the protostar, heating it up further. D) The blue light is absorbed and the red light transmitted. E) It shoots out in bright jets.
Why is it NOT possible to use visible light to investigate the center of our Galaxy?
A. The density of stars toward the Galactic center is so high that it is not possible to see through them. B. The massive black hole located at the center of the Galaxy prevents light from escaping the region. C. Intervening gas locating in the disk of the Galaxy blocks our view of the Galactic center. D. There are no sources of visible light found at the center of the Galaxy.