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

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

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) always remains constant
C) decreases as the waves spread out
D) depends on the source of the waves

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

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

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

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

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

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

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