A periodic wave travels from one medium to another. Which pair of variables are likely to change in the process?
A velocity and wavelength
B velocity and frequency
C frequency and wavelength
D. frequency and phase
E wavelength and phase

While standing outdoors one evening, you are exposed to the following four types of electromagnetic radiation: yellow light from a sodium street lamp, radio waves from an am radio station, radio waves from an fm radio station, and microwaves from an antenna of a communications system. rank these type of waves in terms of increasing photon energy.