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