A) the atmosphere B) a material medium C) a field D) heat
A) a vacuum B) artificial lights C) the high energy of the Sun D) the energy of distant stars
A) motion of a medium caused by EM waves B) energy that moves as EM waves C) speed of EM waves in a vacuum D) conversion of EM waves into kinetic energy
A) always remains constant B) decreases as the waves spread out C) increases as the amount of energy increases D) depends on the source of the waves
A) convert electromagnetic energy into heat B) pass through the water without interacting with it C) are refracted D) are reflected in many directions
A) x-rays B) radio waves C) ultraviolet light D) microwaves
A) gamma rays B) ultraviolet light C) radio waves D) x-rays
A) ultraviolet light B) x-rays C) radio waves D) microwaves
A) infrared light B) microwaves C) ultraviolet light D) radio waves
A) radio waves B) microwaves C) visible light D) ultraviolet light
A) radio waves B) microwaves C) x-rays D) ultraviolet light
A) microwaves B) x-rays C) radio waves D) ultraviolet light |