Answer :
light waves can travel through a medium, but does not require the medium to propagate.
Answer: The correct answer is "light wave".
Explanation:
Sound wave is a longitudinal wave in which the particle of the medium travels parallel to the propagation of the wave.
Sound wave needs medium to travel. It can propagate in solid, liquid and gas.
It can travel fastest in solid in comparison to liquid and gas.
Seismic waves and ocean need medium to travel.
Light wave is transverse in nature. It does not need any medium to travel. It can travel in vacuum. It travels with the speed of the light.
Therefore, light waves can travel through a medium, but does not require the medium to propagate.