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

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

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

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

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

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

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

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

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

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

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

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