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

A) the energy of distant stars
B) a vacuum
C) artificial lights
D) the high energy of the Sun

A) motion of a medium caused by EM waves
B) speed of EM waves in a vacuum
C) conversion of EM waves into kinetic energy
D) energy that moves as EM waves

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

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

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

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

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

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

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

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

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