He won the prize for physics "for his services to Theoretical
Physics, and especially for his discovery of the law of the
photoelectric effect"
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1921--Nobel Prize in Physics "for his services to theoretical physics and especially for his discovery of the law of the photoelectric effect."
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Eyes on the Prize - 1987 A Nation of Law 1968-1971 2-6 was
released on:
USA: 19 February 1990
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Einstein won the 1921 Nobel Prize in Physics "for his services
to theoretical physics, and especially for his discovery of the law
of the photoelectric effect".