The sun is composed mostly of hydrogen. the mass of the sun is 2.0 * 10^30 kg, and the mass of a hydrogen atom is 1.67 * 10^-27 kg. estimate the number of atoms in the sun.

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.