Homogeneity and isotropy, taken as assumptions regarding the structure and evolution of the universe, are known as
A) the cosmological principle.
B) Hubble's law.
C) Wien's law.
D) the Grand Unified Theory.
E) Olbers's paradox.
A
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Why is atmospheric pressure less on top of a mountain than at sea level?
a. It is cooler in the mountains. b. Denser air sinks to sea level; the air on mountains is lighter. c. The pressure at every height in the atmosphere is due to the weight of the air above it. d. None of the above.
Which statement about the cosmic microwave background is not true?
A) It is the result of a mixture of radiation from many independent sources, such as stars and galaxies. B) Its spectrum corresponds to a temperature of just under 3 degrees above absolute zero. C) It is thought to be radiation that began its journey to our telescopes when the universe was about 380,000 years old. D) With the exception of very small variations, it appears essentially the same in all directions in which we look into space.
An excited atom can lose energy by
a. emitting a photon. b. absorbing a photon. c. undergoing the photoelectric effect. d. increasing its de Broglie wavelength. e. the uncertainty principle.
In a parallel RLC circuit, where IR = IR, max sin(?t), the current through the inductor, IL, is
a. IL = ?IL, max sin(?t). b. IL = IL, max sin(?t). c. IL = ?IL, max cos(?t). d. IL = IL, max cos(?t). e. IL = IL, max tan(?t).