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

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

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

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

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

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

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

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

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

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

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