What is the modern of historical monuments,archives and miscellaneous source in studying modern history
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Light or visible light is electromagnetic radiation within the portion of the electromagnetic spectrum that can be perceived by the human eye. Visible light is usually defined as having wavelengths in the range of 400–700 nm, between the infrared and the ultraviolet.
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Explanation:
light or visible light is electromagnetic radiation within the portion of the electromagnetic spectrum that can be perceived by the human eye. visible light is usually defined as having wave lengths in the range of 400-700nm, between the infrared and the ult
raviolet.
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