The sketch above 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 that are extremely bright and emit most of their radiation as ultraviolet light?
A) a B) b C) c D) d E) e
C
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When is an elevator a reasonably good inertial reference frame?
A. Never, under any circumstances. B. Always, since it is attached to the surface of the earth. C. It is good except when it is changing speed. D. Other conditions (describe).
Verizon's "Can you hear me now?" is an example of a company's ______.
A. branding specifications B. tagline C. logo D. visual identity
Binary stars separated enough to be resolved in a telescope are called
A) visual binaries. B) orbital binaries. C) astrometric binaries. D) spectroscopic binaries. E) line-of-sight binaries.
By what factor will an intensity change when the corresponding sound level increases by 3 dB?
a. 3 b. 0.5 c. 2 d. 4 e. 0.3