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

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

A) energy that moves as EM waves
B) speed of EM waves in a vacuum
C) motion of a medium caused by EM waves
D) conversion of EM waves into kinetic energy

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

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

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

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

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

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

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

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