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-as of [20 SEPTEMBER 2024]-
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-‘light’ is ‘electro-magnetic radiation’ within a certain portion of the ‘electro-magnetic spectrum’-
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(the word usually refers to visible light, which is ‘visible’ to the ‘human eye’ and is responsible for the ‘sense’ of ‘sight’)
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*’visible light’ is usually defined as having ‘wave-lengths’ in the range of…*
*’400′ – ‘700’ nano-meters (‘nm’)*
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(in other ‘words’ / (‘numbers’))
(4.00 × 10−7 ) – (7.00 × 10−7 )
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between the ‘infra-red’
(with longer ‘wavelengths’)
…and the ‘ultra-violet’
(with shorter ‘wavelengths’)
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(this ‘wavelength’ means a ‘frequency range’ of roughly ‘430’ – ‘750’ ‘terahertz’ (THz))
(the ‘main source’ of ‘light’ on ‘earth’ is the ‘sun’)
(‘sunlight’ provides the ‘energy’ that ‘green plants’ use to create ‘sugars’ mostly in the form of ‘starches’, which release ‘energy’ into the ‘living things’ that ‘digest’ them)
(this process of ‘photosynthesis’ provides virtually all the ‘energy’ used by ‘living things’)
(historically, another important ‘source of light’ for ‘humans’ has been ‘fire’, from ‘ancient campfires’ to modern ‘kerosene lamps’)
(with the development of ‘electric lights’ and ‘power systems’, ‘electric lighting’ has effectively replaced ‘firelight’)
(some ‘species’ of ‘animals’ generate their own ‘light’, a process called ‘bioluminescence’)
(for example, ‘fireflies’ use light to locate ‘mates’, and ‘vampire squids’ use it to hide themselves from ‘prey’)
(the primary properties of ‘visible light’ are ‘intensity’, ‘propagation direction’, ‘frequency’ or ‘wavelength spectrum’, and ‘polarization’, while its ‘speed’ in a ‘vacuum’, “299,792,458 meters per second'” is one of the ‘fundamental constants’ of ‘nature’)
(‘visible light’, as with all types of ‘electromagnetic radiation’ (EMR), is experimentally found to always move at this ‘speed’ in a ‘vacuum’)
(in ‘physics’, the term light sometimes refers to ‘electromagnetic radiation’ of any ‘wavelength’, whether ‘visible’ or not)
(in this sense, ‘gamma rays’ / ‘x-rays’ / ‘microwaves’ / ‘radio waves’ are also ‘light’)
(like all types of ‘light’, ‘visible light’ is emitted and absorbed in tiny “packets” called ‘photons’ and exhibits properties of both ‘waves’ and ‘particles’)
(this property is referred to as the ‘wave–particle duality’)
(the study of ‘light’ (aka ‘optics’) is an important ‘research area’ in ‘modern physics’)
(the “speed of light” is a ‘constant’)
(actually the speed of all “electromagnetic radiation”)
(299,792,458 meters per second)
“let there be light!”
(“light” is ‘electromagnetic radiation’ with a ‘wavelength’ that is ‘visible’ to the ‘human eye’)
(“color” is the ‘visual perceptual property’ corresponding in ‘humans’ to ‘specific categories’)
(the ‘human eyes’ are 2 ‘organs’ that detect the ‘spectrum’ of ‘light’)
(a condition that is not limited to a specific ‘set of values’ but can vary infinitely within a ‘continuum’)
“opacity”
(light is “not allowed” to travel through)
(“get real!”)
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*👨🔬🕵️♀️🙇♀️*SKETCHES*🙇♂️👩🔬🕵️♂️*
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👈👈👈☜*“NON-IONIZING RADIATION”* ☞ 👉👉👉
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💕💝💖💓🖤💙🖤💙🖤💙🖤❤️💚💛🧡❣️💞💔💘❣️🧡💛💚❤️🖤💜🖤💙🖤💙🖤💗💖💝💘
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*🌈✨ *TABLE OF CONTENTS* ✨🌷*
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🔥🔥🔥🔥🔥🔥*we won the war* 🔥🔥🔥🔥🔥🔥