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

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) energy that moves as EM waves
D) motion of a medium caused by EM waves

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

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

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

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

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

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

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

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