Which of the following best describes the frequency of a wave?

Since you didn't add any answer choices I will explain the frequency of a wave the best I can.

The frequency of a wave is the distance between one crest and another. Frequency can affect the energy of a wave. If the crests in a wave are close together, than the frequency of said wave is high as well as the energy. If they are far apart, than the frequency will be low and the energy will also be low.

Hope this helped.

it doesn't. it was imagined up in the middle ages.

molecules are free to separate from each other and will take on the shape of the container. molecules move completely at random and high speeds. they vibrate in a fixed position and do not move around much. molecules expand to the edge of their container.