All electromagnetic waves travel at the same speed in vacuum.
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Electromagnetic radiation, such as light and radio waves, travels in a straight line. The fastest particle currently known is the neutrino, a subatomic particle with almost no mass and no electric charge.
The type of heat transfer that travels through space in electromagnetic waves is called radiation.
Electromagnetic waves, such as light, can travel through both matter and empty space. This is because electromagnetic waves do not require a medium to propagate, unlike mechanical waves such as sound waves which rely on a medium such as air or water.
Sound travels fastest through solids because the molecules are more closely packed together, allowing for quicker vibration transfer. Sound travels slowest through gases as the molecules are more spread out, causing slower vibration transfer.
All electromagnetic waves travel at the same speed in a vacuum, which is the speed of light, approximately 3.00 x 10^8 meters per second. This includes radio waves, microwaves, infrared, visible light, ultraviolet, X-rays, and gamma rays.