If we consider hypothetically and philosophically, i.e., why we always think light is spreading out. May be dark is fading away as an entity everytime faster than the light. Why faster? Because we haven't detected speed of darkness till now. And I want to connect this concept with Quantum Entanglement. Because according to this concept information is transfered faster than the speed of light between two entity separated by infinite distance. Who knows dark entity may be the answer to Quantum Entanglement??
Darkness means there is no light at all. W/c means darkness is discribed intherms of light that means both have inverse relation.where the speed of light is 3.8×10power of 6 then the speed of darkness is -3.8×10 power of 6
Darkness means there is no light at all. W/c means darkness is discribed intherms of light that means both have inverse relation.where the speed of light is 3.8×10power of 6 then the speed of darkness is -3.8×10 power of 6
To define a "speed" of darkness you would have to measure how long it took for something that had been lit to become dark when something else blocks the light source (e.g., during a lunar eclipse, the Moon becomes dark because the Earth blocks the Moon's view of the Sun).
With that definition, the rate at which "darkness" would spread from the Earth to the Moon is exactly the same as the rate at which light would pass from the where the Earth is to the Moon, if the Earth wasn't in the way. Darkness isn't a thing; it's the absence of light. And as a result, the darkness caused by something blocking light moves at exactly the same speed as light.
Theory of relativity says mass or energy cannot travel at speeds greater than the speed of light. But, shadows do not have any mass or energy. Therefore, shadows can travel at superluminal speeds without violating relativity theory.
This question was addressed by D.J.Griffiths in his book "Introduction to Quantum Mechanics", chapter 12, pg. 427, ("the bug's shadow") and it was shown to be misleading by Vladan Pankovic, Milan Predojevic, Miodrag Krmar and Milan Radovanovic in Ref. https://arxiv.org/pdf/quant-ph/0504071.pdf. (Until now, I haven't seen any Griffiths reply.) This and other papers addressing this question can also be found in https://core.ac.uk/display/2660508?source=3
Consider the falling ball problem. As the ball falls, its shadow moves “from infinity” along the ground toward the point at which it meets the ball. Obviously, the speed of the shadow exceeds the speed of light in parts of its journey. This is discussed on many websites.
Consider spinning around once per second holding a laser pointing out. Consider that part of your trajectory shines the laser spot on the wall of a spaceship which is 50,000 km away from you. As the spot passes over that wall, it is traveling at 2*pi*50000 km per second. That is 3.1415926e8 meters/second, about 5% faster than the speed of light. So the light spot travels across the wall at 1.05 * c, 5% faster than the speed of light! So does that mean light travels faster than the speed of light?
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