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

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) energy that moves as EM waves
C) speed of EM waves in a vacuum
D) motion of a medium caused by EM waves

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) are refracted
C) convert electromagnetic energy into heat
D) pass through the water without interacting with it

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

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

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

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

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

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

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