According to the Big Bang theory, how many forces, and which ones, operated in the universe during the GUT era?
A) two forces: gravity and a single force that later became the strong, weak, and electromagnetic forces
B) one force that represented the unification of all four forces that operate today
C) three forces: gravity, the strong force, and the electroweak force
D) two forces: the strong force and the electroweak force
A) two forces: gravity and a single force that later became the strong, weak, and electromagnetic forces
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The discovery that the Universe is expanding faster today than in the past was possible because of observations of
A. Cepheid variable stars. B. Type II (core collapse) supernovae. C. galaxy rotation curves. D. Type Ia (white dwarf) supernovae.
The process occurring when photons bounce off a polished surface is called:
A) diffraction. B) refraction. C) reflection. D) dispersion. E) interference.
Historians trace the origins of a 24-hour day to
A) the druids of Stonehenge. B) the ancient Egyptians. C) the Mayans. D) the Aztecs. E) the Babylonian astronomer, Meton.
A parallel plate capacitor is connected to a battery and charged to voltage V. Leah says that the charge on the plates will decrease if the distance between the plates is increased while they are still connected to the battery. Gertie says that the charge will remain the same. Which one, if either, is correct, and why?
a. Gertie, because the maximum voltage is determined by the battery. b. Gertie, because the capacitance of the capacitor does not change. c. Leah, because the capacitance decreases when the plate separation is increased. d. Leah, because the capacitance increases when the plate separation is increased. e. Neither, because the charge increases when the plate separation is increased.