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

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

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

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

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

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

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

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

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

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

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