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

Physics & Space Science

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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

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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

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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

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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.

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