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

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

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

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

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

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

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

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

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

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

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