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time traveller d
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there is the speed of light. just wondering, is there a speed of darkness. if so, what is it.
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That's a funny one. Reminds me of something I used to tell the kids to get them to close the door at night: "Don't let the dark in."time traveller d said:, is there a speed of darkness.
I would like to take issue with this comment. Being a certified cave diver I have experienced complete and total darkness many times. When your light goes out a few thousand feet from the cave entrance is gets pitch black. There is certainly no visible light being emitted by the cave walls or the water.deepak9191 said:darkness doesn't existbcoz light is present everywhere . remember that light is a wave and has no definite size and shape so it can be present everywhere . even the black hole is not devoid of it. its just a matter that in a black hole we are una ble to see light
-Job- said:Not exactly. Initially, the farther away the wall is, the faster the shadow will appear to move, but, eventually, the speed of "darkness" should stop increasing with the distance. If you had a really big hand and covered a star in a nearby galaxy with your hand, then as you waved your hand around you'd still have to wait for the light to travel to the "wall". So you can't make "darkness" have infinite velocity or be faster than light.
-Job- said:The relation between the "speed of darkness" and distance from the hand to the wall is somewhat bellshaped. Meaning that, initially, as the distance increases, the faster darkness will seem to move, until this distance reaches a point after which the darkness not only can't move any faster, but will start to move more slowly.
Ki Man said:absence of light is darkness
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it is nothing
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we'll solve this problem right after we figure out the speed of silence
Tide said:The speed of darkness has been measured as negative 300,000 km/s. :)
There have been a lot of good replies to your question so far. Here's my two cents.time traveller d said:there is the speed of light. just wondering, is there a speed of darkness. if so, what is it.
explorer2909 said:I think I am supposed to give the link of the document I quote, here is the link, crackpot link deleted
I have two more questions after reading the article, 'How do we perceive light?' 'Why we cannot see the sun or any other light source even when our eyes can absorb the photons emitted by the sun?'
and, as shown in one of the experiment in the article, 'how can image in the mirror be formed even when path of the light between the mirror and the object is blocked?'
The concept of darkness does not have a physical speed, as it is the absence of light. Therefore, it cannot be measured in terms of speed.
Yes, according to the theory of relativity, the speed of light in a vacuum is the fastest possible speed and is considered a fundamental constant in the universe.
Light travels in a straight line and does not require a medium to propagate, meaning it can travel through a vacuum. It is made up of electromagnetic waves that oscillate in a perpendicular direction to the direction of travel.
Yes, the perception of light can vary from person to person due to differences in the structure and function of their eyes and brain. This can result in variations in color perception, brightness, and even the ability to see certain wavelengths of light.
Yes, the speed of light is a physical measurement of how fast light travels, while the speed of perception is a subjective experience that can vary based on an individual's perception and processing of visual information.