Which of the following has the shortest wavelength?
a) Visible light
b) Gamma Ray
c) Ultraviolet
d) Radiowaves
Ans: b) Gamma Ray
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The majority of lunar craters formed when ________.
A. tidal forces from Earth cracked the Moon's surface B. lunar volcanoes erupted C. pieces of the Moon fell off, leaving holes in its surface D. solid bodies such as asteroids impacted the Moon's surface
In which case would the net force due to water pressure on a solid object be greater?
(i) when the object is in water at 100-meter depth (ii) when the object is in water at 200-meter depth
1.(i) 2.(ii) 3.Choices (i) and (ii) would have the same net force due to the water on them. 4.It depends on the orientation of the object.Physically, why is a gas molecule’s speed v more likely to be near vp than near zero?
A. There are fewer quantum states with smaller speeds than larger speeds.
B. The Boltzmann factor has a larger value near v = vp than near v = 0.
C. We know that 
Experiments allow physicists today to reproduce (on very small scales) energy and temperature conditions thought to have prevailed in the early universe as far back in time as about
A) one ten-billionth (10-10) of a second after the Big Bang. B) 380,000 years after the Big Bang. C) 10-45 seconds after the Big Bang. D) 10 billion years ago.