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

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

A) conversion of EM waves into kinetic energy
B) speed of EM waves in a vacuum
C) motion of a medium caused by EM waves
D) energy that moves as 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) pass through the water without interacting with it
C) are reflected in many directions
D) convert electromagnetic energy into heat

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

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

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

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

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

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

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