Electromagnetic waves can exist only at one speed.
The Electromagnetic Spectrum.
Electromagnetic waves, such as light and radio waves, can travel through a vacuum because they do not require a medium to propagate. This is possible due to the nature of electromagnetic radiation as oscillating electric and magnetic fields that can exist independently of a medium.
The word for the entire range of energy waves that exist in the universe is the electromagnetic spectrum. It includes all forms of electromagnetic radiation, from radio waves to gamma rays.
The types of electromagnetic waves that exist include radio waves, microwaves, infrared, visible light, ultraviolet, X-rays, and gamma rays. These waves vary in frequency and energy, with radio waves having the lowest frequency and energy, and gamma rays having the highest.
A transverse wave may, or may not, be a mechanical wave (electromagnetic waves are also transverse).I don't know about congressional waves; you may want to ask a representative of congress in your country.
mainly electromagnetic radiation, heat and light, but with a dash of radio waves and particles as well.Gravity waves should exist as well, but we yet have the apparatus to reliably detect them.
It depends. Is it a mechanical wave or a electromagnetic wave? Mechanical waves (for example sound waves) travel trough every state of matter and they can't exist without matter. They don't travel through vacuum. Electromagnetic waves travel trough space and get interrupted only by other electromagnetic waves.
The two waves which do not require a medium are electromagnetic waves, also known as light and gravitational waves. Gravity waves have not been detected yet but are predicted by general relativity so are expected to exist.
Radio waves ARE electromagnetic waves.
Electromagnetic waves are transferred by electromagnetic radiation.
first we must ask our selves do these waves really exist?
No, electromagnetic waves require the mutual generation of electric and magnetic fields. This reciprocal relationship allows the waves to propagate through space as self-sustaining oscillations. If only one field could generate the other but not vice versa, electromagnetic waves would not exist.