In a longitudinal wave, the compressions and rarefactions travel in
A) the same direction.
B) opposite directions.
C) neither A nor B
A
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If the frequency of a certain wave is 10 Hz, its period is
A) 0.1 s. B) 10 s. C) 100 s. D) none of the above
What is a reduction?
A. the reaction of oxygen with a reductant B. the gain of electrons C. the loss of an electron from the valence shell D. the formation of red compounds in the presence of an oxidant E. the reduction of the number of electrons
What role does the Toxic Substances Control Act play in the hazardous-waste arena?
What will be an ideal response?
Which of the following best summarizes how atmospheric concentrations of carbon dioxide change throughout the course of a year?
A. They tend to remain stable. B. They tend to go up and down. C. They tend to keep decreasing. D. They tend to keep increasing.