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

A) a vacuum
B) the energy of distant stars
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) depends on the source of the waves
C) increases as the amount of energy increases
D) decreases as the waves spread out

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

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

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

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

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

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

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

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