The ____________________ is a measure of the clarity of the atmosphere
Fill in the blank(s) with correct word
seeing
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Schwarzschild showed how the _______________ of the event horizon depends only on the mass of the black hole
Fill in the blank(s) with correct word
The age of stars in a cluster can be determined by
A) finding spectroscopic binaries in the cluster. B) determining the main sequence turnoff point. C) finding pulsating variable stars in the cluster. D) counting the number of stars in each spectral class. E) fitting the position of the main sequence to the Sun.
Two equal point charges of magnitude 4.0 ?C are situated along the x-axis at x1 = -2.0 m and x2 = -2.0 m. What is the electric potential energy of this system of charges?
A) -36 mJ B) 36 mJ C) 0 J D) -72 mJ E) 72 mJ
Since all stars begin their lives with the same basic composition, what characteristic most determines how they will differ?
A) time they are formed B) mass they are formed with C) color they are formed with D) luminosity they are formed with E) location where they are formed