The energy of an ultraviolet photon is ________ a photon in the visible part of the spectrum.
A. shorter than
B. longer than
C. higher than
D. lower than
E. faster than
Answer: C
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Why do sunspots appear dark in pictures of the Sun?
A) They actually are fairly bright, but appear dark against the even brighter background of the surrounding photosphere. B) They are too cold to emit any visible light. C) They are holes in the solar surface through which we can see through to deeper, darker layers of the Sun. D) They are extremely hot and emit all their radiation as X rays rather than visible light.
Galaxies are classified into types solely on the basis of their color
Indicate whether the statement is true or false
What is dispersion?
a. The reflection of colors off the surface of a bright-colored translucent object, like a jewel. b. The refraction of light as it passes from air into water. c. The separation of colors of light because their waves superpose. d. The separation of light into different colors because of how different colors of light refract differently. e. The combination of a spectrum of colored lights into white light.
During the Pleistocene ice age
A) there was one large episode of glacial advance. B) there were several episodes of glacial advance and retreat. C) Earth's entire surface was covered with ice. D) Earth's oceans were completely frozen.