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Light, visible light, or visible radiation is electromagnetic radiation that can be perceived by the human eye. [1] Visible light spans the visible spectrum and is usually defined as having wavelengths in the range of 400–700 nanometres (nm), corresponding to frequencies of 750–420 terahertz .
Light pollution is the presence of any unwanted, inappropriate, or excessive artificial lighting. [1] [2] In a descriptive sense, the term light pollution refers to the effects of any poorly implemented lighting sources, during the day or night. Light pollution can be understood not only as a phenomenon resulting from a specific source or kind ...
where E is the energy of the quantum , f is the frequency of the light wave, h is the Planck constant, λ is the wavelength and c is the speed of light. The relationships between the energies of the various quantum states are treated by atomic orbital, molecular orbital, Ligand Field Theory and Crystal Field Theory.
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"Let there be light" is an English translation of the Hebrew יְהִי אוֹר (yehi 'or) found in Genesis 1:3 of the Torah, the first part of the Hebrew Bible. In Old Testament translations of the phrase, translations include the Greek phrase γενηθήτω φῶς ( genēthḗtō phôs ) and the Latin phrases fiat lux and lux sit .
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The Light of the World, by Holman Hunt 1851, in St Paul's Cathedral "Light of the World" (Greek: φώς τοῦ κόσμου Phṓs tou kósmou) is a phrase used by Jesus to describe himself and his disciples in the New Testament. [1] The phrase is recorded in the Gospels of Matthew and John (8:12).