Do radio waves travel at the speed of sound at the speed of light or somewhere in between?
Radio waves are electromagnetic waves and thus travel at the speed of light, much faster than the speed of sound. Your friend says that outer space, instead of being empty, is chock full of electromagnetic waves.
Do radio waves travel at the speed of sound at the speed of light or at some speed between the two?
Radio waves are a form of EMR—electro-magnetic radiation, the same as light. Thus, they both travel at light speed (299,792.458 km/hr). Thus, sound carried by radio wave (299,792,458 m/s) will reach you much faster than sound that travels simply as a standard sound wave (343 m/s).
Do all radio waves travel same speed?
All electromagnetic waves travel at the same speed through empty space. That speed, called the speed of light, is about 300 million meters per second (3.0 x 108 m/s). Nothing else in the universe is known to travel this fast.
What waves travel at the speed of light?
Wavelength increases, while frequency and energy decreases as we go from gamma rays to radio waves. All electromagnetic radiation travels at the speed of light (186,000 miles or 300,000,000 meters per second in a vacuum).