When the distance between two charges is halved, the electrical force between them
A) is reduced by 1/4.
B) halves.
C) doubles.
D) quadruples.
E) none of the above
Answer: D
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Why do scientists think tiny quantum ripples should have been present in the very early universe?
A) The shock wave of the Big Bang caused ripples that expanded outward with time. B) The energy released when the strong force froze out of the GUT force caused shock waves that produced ripples in the universe. C) Matter and antimatter particles that spontaneously formed from high-energy photons caused disruptions in the radiation field. D) The annihilation of matter and antimatter particles caused tiny explosions that disrupted the radiation field. E) Quantum mechanics tells us that the energy fields at any point in space be continually fluctuating as a result of the uncertainty principle.
Protostars are difficult to observe because
a. the protostar stage is very short.
b. they are surrounded by cocoons of gas and dust.
c. they radiate mainly in the infrared.
d. the protostar stage is very short, they are surrounded by cocoons of gas and dust, and they radiate mainly in the infrared.
e. they are all so far away that the light hasn't reached us yet.
Stars that have masses similar to the Sun's, and sizes similar to the Earth are
A) main sequence stars. B) white dwarfs. C) red giants. D) red dwarfs. E) brown dwarfs.
Does the average distance that a neutron travels through fissionable material before escaping increase or decrease when two pieces of fissionable material are assembled into one piece?
Does this assembly increase or decrease the probability of an explosion? A) The average distance increases while the probability of an explosion also increases. B) The average distance decreases while the probability of an explosion decreases. C) The average distance increases while the probability of an explosion decreases. D) The average distance decreases while the probability of an explosion increases.