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

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

A) speed of EM waves in a vacuum
B) conversion of EM waves into kinetic energy
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) depends on the source of the waves
C) always remains constant
D) decreases as the waves spread out

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

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

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

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

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

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

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

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