Concept:Electromagnetic radiation can travel through a vacuum without needing a material medium.
Explanation:X-rays, radio waves, and sunlight are all forms of electromagnetic radiation.
They transfer energy by oscillating electric and magnetic fields.
Sound waves are different because they are mechanical waves.
Sound waves require a material medium such as air, water, or solid objects to travel.
Sound cannot travel through a vacuum, while electromagnetic radiation can.
Therefore, sound waves are not an electromagnetic radiation.
Answer:D. sound waves