Seen from the northern latitudes, the star Polaris
a. is never above the horizon during the day.
b. always sets directly in the west.
c. is always above the northern horizon.
d. is never visible during the winter.
e. is the brightest star in the sky.
c
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Shapley used the distribution of globular clusters in the galaxy to determine that the Sun was not at the center of the Milky Way
Indicate whether the statement is true or false
In an ideal case rays coming from an object toward a lens or mirror should be reasonably close to the optic axis. To the extent that this condition is not completely met, which one of the following effects occurs?
a. spherical aberration b. mirages c. chromatic aberration d. light scattering
A primary waste product of nuclear reactors that are designed for only power generation is
A. graphite. B. high-pressure steam. C. radioactive materials. D. enriched uranium.
The energy of an ultraviolet photon is more than the energy of an infrared photon
Indicate whether the statement is true or false