Given a concave mirror, rays of light originating from the center of curvature reflect off the mirror and focus at
A) 2 R from the mirror.
B) the focal point.
C) the center of curvature.
D) infinity.
C
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Indicate whether the statement is true or false
The primordial nucleosynthesis was sped up by the abundance of ________ in the universe once the temperature dropped below a billion K
A) helium-3 B) hydrogen C) deuterium D) tritium E) helium
Which of the following hypothetical observations would demonstrate that the inflation model was incorrect?
A) The geometry of the universe is curved, not flat. B) The helium abundance in a galaxy is 29%. C) The rate of expansion of the universe has changed over time. D) Stars began to shine only a few hundred million years after the Big Bang.
This graph shows the rotation curves of four different spiral galaxies. Based on these curves, what do all four galaxies have in common?
A) Their most distant stars all orbit at about the same speed as stars located about 30,000 light-years from their centers. B) Their fastest-moving stars are always located within about 1,000 light-years of their centers. C) They all have supermassive black holes near their centers. D) All their stars take about 200 million years to complete a single orbit, no matter how far they are from the galactic center.