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

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

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

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

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

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

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

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

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

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

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

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