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

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

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

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

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) ultraviolet light
C) microwaves
D) radio waves

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

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

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

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

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

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