He received the [[Nobel Prize]] in 1921 "for his services to Theoretical Physics, and especially for his discovery of the law of the photoelectric effect"<ref>http://nobelprize.org/nobel_prizes/physics/laureates/1921/</ref>. | He received the [[Nobel Prize]] in 1921 "for his services to Theoretical Physics, and especially for his discovery of the law of the photoelectric effect"<ref>http://nobelprize.org/nobel_prizes/physics/laureates/1921/</ref>. |