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