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

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

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

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

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

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

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

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

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

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

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

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