A) a field
B) the atmosphere
C) a material medium
D) heat

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) energy that moves as EM waves
D) motion of a medium caused by EM waves

A) depends on the source of the waves
B) always remains constant
C) increases as the amount of energy increases
D) decreases as the waves spread out

A) are reflected in many directions
B) are refracted
C) pass through the water without interacting with it
D) convert electromagnetic energy into heat

A) ultraviolet light
B) microwaves
C) radio waves
D) x-rays

A) ultraviolet light
B) gamma rays
C) radio waves
D) x-rays

A) radio waves
B) x-rays
C) microwaves
D) ultraviolet light

A) infrared light
B) microwaves
C) ultraviolet light
D) radio waves

A) visible light
B) microwaves
C) radio waves
D) ultraviolet light

A) microwaves
B) ultraviolet light
C) radio waves
D) x-rays

A) ultraviolet light
B) x-rays
C) radio waves
D) microwaves