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Joined: Jul 2002
Posts: 499
Sage
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Sage
Joined: Jul 2002
Posts: 499 |
Definition of light... MTO3 Paypacket after tax and NI.
LIII
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كيف الآن يحمّر البقرة
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Joined: Sep 2003
Posts: 28
Dreamer
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OP
Dreamer
Joined: Sep 2003
Posts: 28 |
I regard light as photons travelling at c. I changed the definition of light in Wikipedia about a month ago and it now reads
"Light is electromagnetic radiation with a wavelength that is visible to the eye or, in a technical or scientific setting, electromagnetic radiation of any wavelength. "
The wiki community seem to have accepted this definition so far....
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Joined: Jul 2002
Posts: 2,020
Hero
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Hero
Joined: Jul 2002
Posts: 2,020 |
c= speed of light in a vacuum.
Radio waves travel at the speed of light, are they light?
I think c is the speed of electromagnetic radiation in a vacuum.
Do you then define all electro-magnetic radiation as light?
I doubt it so I think this reverse definition does not work.
How far away from the visible light do you actually take the definition?
Robert
My spelling is not bad. I am typing this on a Medigenic keyboard and I blame that for all my typos.
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Joined: Jul 2002
Posts: 499
Sage
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Sage
Joined: Jul 2002
Posts: 499 |
Think Sound My friends, think sound, Sub Sonic,
Supersonic, all mechanical pressure waves, we mortal humanoids only hear 20 CPS to 20,000 CPS ( or absolutley nothing if your name is Mr Hutton).
LIII
No trees were harmed in the posting of this message. However, a large number of electrons were terribly inconvenienced.
كيف الآن يحمّر البقرة
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Joined: Jan 2005
Posts: 768
Philosopher
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Philosopher
Joined: Jan 2005
Posts: 768 |
Definition of Light:
Electromagnetic radiation that's visible to the typical unaided human eye.
Visible light consists of electromagnetic energy in wavelengths that range from about 360nm and 400nm at the lower end to 760nm and 830nm at the high end, depending on the person and the intensity of light in question. (eg. the human eye is better able to detect some colours at low intensities than others.)
To be pedantic, the terms "visible light" and "invisible light" are respectively redundant and illogical by this fairly standard definition since light is always visible and non-light EMR is not. But the terms are nonetheless frequently used because they're useful concepts. In particular, both near-visible infrared and near-visible ultraviolet can be affected and modified optically, unlike other forms of non-light electromagnetic radiation.
(Taken from PhotoNotes.org)
Sometimes You Can't Make It On Your Own.
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Joined: Sep 2003
Posts: 28
Dreamer
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OP
Dreamer
Joined: Sep 2003
Posts: 28 |
Rojo in a technical setting,to answer your questions
Radio waves travel at the speed of light, are they light? Yes
Do you then define all electro-magnetic radiation as light? Yes
How far away from the visible light do you actually take the definition? The entire electromagnetic spectrum
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Joined: Aug 2005
Posts: 5
Newbie
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Newbie
Joined: Aug 2005
Posts: 5 |
As I said her come the syllogisms:
Max speed of a cheetah = 100kph
Max speed of my car (Since Ford serviced it)= 100kph.
Therefore my car is a cheetah.
(I was sure it was a Jaguar)
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