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

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

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

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

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

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

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

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

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