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

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

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

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

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

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

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

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

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

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