When we say that the electromagnetic and weak forces "freeze out" from the electroweak force at 10-10 seconds after the Big Bang, we mean that
A) these forces are important only at temperatures below the freezing point of water—a temperature that the universe reached at an age of about 10-10 second.
B) "freezing out" was a term coined by particle physicists who think that the Big Bang theory is really cool.
C) prior to this time the electromagnetic and weak forces maintained a single identity, but they possessed separate identities following this time.
D) following this time neither the electromagnetic nor the weak force was ever important in the universe again.
E) quantum fluctuations by high-speed, relativistic particles in a state of false vacuum cause disturbances in the spacetime continuum, leading to the process described in the question this answer refers to.
C
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Which statement most accurately describes the relationship between the largest and smallest planets?
A) The largest planet is 6000 times as wide (in diameter) and 30 times as massive as the smallest. B) The largest planet is 6000 times as wide (in diameter) and 6000 times as massive as the smallest. C) The largest planet is 30 times as wide (in diameter) and 30 times as massive as the smallest. D) The largest planet is 30 times as wide (in diameter) and 6000 times as massive as the smallest.
Suppose that Earth's ice caps melted, but everything else about the Earth's surface and atmosphere stayed the same. What would happen to Earth's average surface temperature?
A) The surface temperature would increase. B) The temperature would not be affected at all. C) The surface temperature would decrease. D) The surface temperature would change radically, until it was equal to the melting temperature of ice.
When did the photons in the cosmic microwave background first travel freely through the universe?
A) the moment of the Big Bang B) about 10-10 second after the Big Bang C) about 5 minutes after the Big Bang D) about 380,000 years after the Big Bang E) At the time, the first stars began to shine in the universe.
What is the preferred name for Mg3N2?
a. Magnesium trinitride b. Magnesium nitride c. Dimagnesium trinitride d. Manganese nitrate