A charge of uniform volume density (40 nC/m3) fills a cube with 8.0-cm edges. What is the total electric flux through the surface of this cube?
a. 2.9 N × m2/C
b. 2.0 N × m2/C
c. 2.6 N × m2/C
d. 2.3 N × m2/C
e. 1.8 N × m2/C
D
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The crossover point from radiation to matter domination occurred:
A) when the strong force separated from the other two forces. B) with the emission of the cosmic background radiation. C) about 50,000 years after the Big Bang, at a temperature of about 16,000 K. D) with the creation of neutrons and protons, at about 1013 K. E) with the creation of electrons and positrons at about 6 × 109 K.
The method of spectroscopic parallax cannot be applied to stars beyond about 100 pc
a. True b. False Indicate whether the statement is true or false
On this graph, the time corresponding to the point at the far lower right of the diagonal line represents
A) the age of the universe today, in seconds. B) age of the universe at the time the cosmic microwave background was released. C) the Planck time. D) the amount of time required for nucleosynthesis in the early universe.
Kepler based his theories on the precise planetary observations of Tycho Brahe
Indicate whether the statement is true or false