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

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

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

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

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

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

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

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

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

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

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

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