How long after the Big Bang was the Planck time, the time at which our current theories become completely unable to describe conditions any earlier in the universe?
A) 380,000 years
B) 10-35 seconds
C) 10-10 seconds
D) 10-43 seconds
E) 3 minutes
D
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During winter at a particular pole on Mars, some of the carbon dioxide in the atmosphere
A) freezes out onto the surface B) escapes into space C) condenses into liquid on the surface D) is destroyed by ultraviolet radiation from the Sun
Materials generally become warmer when light is
A) absorbed by them. B) reflected by them. C) transmitted by them. D) all of the above E) none of the above
Is the moon accelerated?
A) No, because there is no gravity in space. B) No, because the gravitational force on it is balanced by the centrifugal force. C) Yes, its acceleration is directed forward, along its direction of motion. D) Yes, its acceleration is directed inward toward Earth. E) Yes, its acceleration is directed outward away from Earth.
The Schrödinger equation is most useful for describing
A) submicroscopic particles. B) microscopic particles. C) macroscopic particles. D) none of the above