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

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

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

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

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

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

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

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

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

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

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

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