Which chemical elements were created during the first few minutes of the "big bang" that started our universe?
A) All 92 of the naturally-occurring chemical elements.
B) Only the elements through iron in the periodic table, i.e., only elements 1 through 26.
C) Only the first three elements: hydrogen, helium, and lithium.
D) Only the heaviest elements, having atomic numbers higher than that of lead.
E) No elements were produced during the big bang--all the normal chemical elements were produced much later.
C
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What are greenhouse gases?
A) gases that absorb visible light B) gases that absorb ultraviolet light C) gases that absorb infrared light D) gases that emit visible light E) gases that transmit infrared light
A car hits another and the two bumpers lock together during the collision. Is this an elastic or inelastic collision?
A) elastic B) inelastic C) insufficient information (It could be either.)
Dispersion occurs when:
a. some materials bend light more than other materials. b. a material slows down some wavelengths more than others. c. a material changes some frequencies more than others. d. light has different speeds in different materials.
If we know that a nonzero net force is acting on an object, which of the following must we assume regarding the object's condition? The object is:
a. at rest. c. being accelerated. b. moving with a constant velocity. d. losing mass.