The unusually bright centers found in some galaxies are called
A) active galactic nuclei.
B) halos.
C) supermassive black holes.
D) starbursts.
A) active galactic nuclei.
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Which of the following statements is true of the protons in an atom?
A) They are electrically neutral. B) They are positively charged. C) They lack an electric field around them. D) They are made up of multiple neutrons.
From what do stars form?
A. black holes B. interstellar clouds C. open clusters D. planetary nebulas E. globular clusters
In a RLC circuit, the values of the inductance and capacitance are both doubled. In comparison with the resonance frequency of the original circuit, the new resonant frequency will be
A) the same as before. B) reduced to one-half the original value. C) reduced to one-quarter the original value. D) increased by a factor of two. E) increased by a factor of four.
Two nuclei have the same number of protons but different numbers of neutrons. We call these two nuclei
A. ions. B. atomic mass units. C. isotopes. D. isobars.