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Why intensity of light(wave) is proportional to the square of its amplitude?

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I am confused, Classical wave theory says that Intensity of the light(wave) is the proportional to square of the amplitude. How intensity is proportional to the square of the amplitude?

Source: Why intensity of light(wave) is proportional to the square of its amplitude?

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Born in 1964, business owner, from Woodbridge, VA, owns ExcitingAds! Inc. (http://www.excitingads.com) and blog (https://search.excitingads.com). He was born in Mirpurkhas, Sind, Pakistan. His elementary school was ST. Michael's Convent High School, Mirpurkhas, Sind, Pakistan. Graduated high school from ST. Bonaventure's Convent High School, Hyderabad, Sind, Pakistan. His pre-med college was S. A. L. Govt. College, Mirpurkas, Sind, Pakistan. Graduated from Liaquat University of Medical and Health Sciences, Jamshoro, Sind, Pakistan in 1990. Earned equivalency certification from Educational Commission for Foreign Medical Graduates, Philadelphia, PA in 1994.

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