Which is a property of light a: mass b: density c: wavelength d: pitch

Greg drew a diagram to compare two of the fundamental forces. which labels belong in the areas marked x, y and z? gravitational force electromagnetic force x. attractive y repulsive z: infinite range x: infinite range y attractive z. repulsive x. always attractive y: infinite range z: attractive or repulsive x. attractive or repulsive y infinite range z: always attractive

This is the number of complete movements of a wave per second.

Select all the correct answers. which three statements about electromagnetic radiation are true?