Question

the number of crests of a wave that pass a certain point in a given amount of time. wavelength frequency wave electromagnetic wave radiation

Explanation:

Frequency is defined as the number of wave - crests (or cycles) that pass a fixed point in a given amount of time. Wavelength is the distance between two consecutive crests. A wave is a general disturbance that transfers energy. An electromagnetic wave is a type of wave that consists of electric and magnetic fields. Radiation can refer to the emission or transmission of energy in the form of waves or particles.

Answer:

B. frequency