Final answer:
Electromagnetic waves encompass a range of waves that do not require a medium to travel and include radio waves, microwaves, infrared waves, X-rays, and gamma rays.
Explanation:
Electromagnetic waves are waves that consist of oscillating electric and magnetic fields and do not require a medium to propagate. They include radio waves, microwaves, infrared waves, X-rays, and gamma rays among others. These waves travel at the speed of light in a vacuum, which is approximately 3.0 × 108 m/s.
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