Which of the following is not a phase of the Moon?
A) first-quarter moon
B) third-quarter moon
C) half moon
D) full moon
E) new moon
C
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What do we mean by the singularity of a black hole?
A) There are no binary black holes—each one is isolated. B) An object can become a black hole only once, and a black hole cannot evolve into anything else. C) It is the center of the black hole, a place of infinite density where the known laws of physics cannot describe the conditions. D) It is the edge of the black hole, where one could leave the observable universe. E) It is the "point of no return" of the black hole; anything closer than this point will not be able to escape the gravitational force of the black hole.
What evidence tells us that quasars are the centers of distant galaxies?
A) Rapid variations in quasar luminosity tell us that they must be quite small in size. B) Quasars are extremely luminous. C) All quasars have large redshifts. D) Images and spectra show quasars to be embedded at the centers of distant galaxies.
List two conditions for producing an electric current in a circuit
What will be an ideal response?
Spectral Series: To which of the following values of n does the shortest wavelength in the Balmer series correspond?
A. 3 B. 5 C. 7 D. 1 E. ? (very large)