Which best describes the difference between wave a and wave b? wave a has a greater intensity and transfers more energy. wave b has a greater intensity and transfers more energy. wave a transfers more energy, but wave b has a greater intensity. wave b transfers more energy, but wave a has a greater intensity.

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Solution:
the correct answer is 
Wave B has a greater intensity and transfers more energy. 

In fact, wave B has higher frequency (the number of oscillations per unit time is larger than wave A), and since the energy of a wave is proportional to its frequency, wave B transfers more energy than wave A. Moreover, the amplitude of wave B is larger than that of wave A, and since the intensity of a wave is proportional to the square of the amplitude, it means that wave B has greater intensity than wave A.

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