According to the Big Bang theory, how many forces—and which ones—operated in the universe during the GUT era?
A) 1 force that represented the unification of all four forces that operate today
B) 3 forces: gravity, the strong force, and the electroweak force
C) 2 forces: the strong force and the electroweak force
D) 2 forces: gravity and a single force that later became the strong, weak, and electromagnetic forces
D
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Normally a small party balloon charged to several thousand volts will have a relatively small amount of
A) charge. B) energy. C) both of these D) neither of these
The half-life of a radioactive substance is affected by
A) pressure. B) temperature. C) age. D) all of the above E) none of the above
The fact that desert sand becomes very hot in the day and very cold at night is evidence that sand has a
A) low specific heat capacity. B) high specific heat capacity. C) none of the above
According to Einstein, as the wavelength of the incident monochromatic light beam becomes shorter, the work function of a target material in a phototube:
a. increases. b. decreases. c. remains constant. d. is directly proportional to wavelength.