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

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

A) energy that moves as EM waves
B) conversion of EM waves into kinetic energy
C) speed of EM waves in a vacuum
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) pass through the water without interacting with it
B) are reflected in many directions
C) convert electromagnetic energy into heat
D) are refracted

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

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

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

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