Red sunsets are due to light of lower frequencies that
A) are scattered from larger particles in the air.
B) are scattered from smaller particles in the air.
C) survive being scattered in the air.
D) are reflected by clouds and relatively large particles in the air.
E) appear reddish-orange to the eye.
Answer: C
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What causes stars to twinkle?
A) It is intrinsic to the stars—their brightness varies as they expand and contract. B) variations in the absorption of light at different depths in Earth's atmosphere C) variable absorption by interstellar gas along the line of sight to the star D) bending of light rays by turbulent motions of air in Earth's atmosphere E) the inability of the human eye to focus on small points of light
In the operation of a laser
a. stimulated emission occurs. b. there is a population inversion. c. the excited state will tend to be metastable. d. the photons emitted will have transitioned to the ground state. e. For the answers (a), (b), (c), and (d), three are correct and one is incorrect.
Constructive interference is a result of two waves arriving at a point ________.
Fill in the blank(s) with the appropriate word(s).
What would happen if more mass was added to a 1.4 solar mass neutron star?
A) It would erupt as a Type I supernova. B) It could eventually become a black hole, via a hypernova explosion. C) It would grow larger, temporarily becoming a red giant again. D) All of its protons and electrons would turn into quarks. E) It would blow off mass as a gamma ray burster.