This photo shows
A) an asteroid
B) Pluto
C) a dwarf planet
D) Mercury
A) an asteroid
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If there were lots of baryons present during the early moments of the big bang, they would have:
A) collided with deuterium to make helium. B) collided with lithium to make helium. C) collided with and destroyed deuterium. D) collided with each other to from deuterium.
If water at 4°C slightly decreases in temperature, the water
A) contracts. B) expands. C) neither of these
Radioactive Decay: Given that the half-life for radium-226 is 1600 y, how long is the "quarter-life" (that is, the time for the radiation to decay to one-fourth of its initial level)?
Fill in the blank(s) with the appropriate word(s).
Radiation: If the absolute temperature of an object is tripled, the thermal power radiated by this object (assuming that its emissivity and size are not affected by the temperature change) will
A. increase by a factor of 3. B. increase by a factor of 9. C. increase by a factor of 18. D. increase by a factor of 27. E. increase by a factor of 81.