Darkness is only the absence of light. The 'speed of darkness', or the speed at which darkness 'propagates' (even though only the absence of photons is propagating) is therefor equal to the speed of light.
It depends. If this is a theological question then the answer should be no as darkness represents evil and evil is almost always thought of as inferior to good. If this is an astrophysical question then the answer would probably be yes as space expands faster than the speed of light so there is more darkness in he universe than light and the light will eventually die off but darkness will still be left.
The speed of light is much greater than the speed of sound.
Why is the speed of the electron beam greater than the speed of light in cathode ray oscilloscope.
The speed is the same. Light travels at a finite speed.
Darkness doesn't have a speed. What you are seeing is the light leaving. You could say it's the same as the speed of light but it's really just your perception that darkness is moving but it's really the absence of light.
Ultraviolet light travels at a greater speed than infrared light. This is because the speed of light is constant in a vacuum, and different wavelengths of light, such as ultraviolet and infrared, have varying frequencies and energies.
Dark does not exist, it is only the absence of light. Darkness is not an entity, so it does not travel and has no speed. In principle, a shadow or nonentity could "travel" faster than the speed of light. For example, if you pivoted a powerful laser a few degrees the point of light would travel across a screen very far away at a "speed" greater than light. Note that this is not at all faster than light motion. You could achieve a similar effect by casting shadows on things very far away. But none of this is actually a "speed."
They don't. Nothing can exceed the speed of light. Electrons in a television travel much slower than the speed of light.
The speed of light is the speed at which electromagnetic waves propagate through a medium. The speed of sound is the speed at which acoustic waves propagate through a medium. As the speed of sound relies on the medium moreso than the speed of light, sound propagates much slower than light.
Nothing does. That speed is 3.5% greater than the speed of light.
probably all kinds of technology
This is called the index of refraction. When light crosses the boundary between mediums (media) with different indices, it is bent (refracted).It's usually defined the other way around ... the ratio of the speed of light in vacuum to its speed in the medium. Since the speed of light is greater in vacuum than in any medium, the number is always greater than 1. It's referred to as the "refractive index" of the medium.