he received the 1921Nobel Prize in Physics "for his services to theoretical physics,and especially for his discovery of the law of the photoelectric effect 电效应)”.The latter was pivotal in establishing quantum theory(量子). 0▪ he received the 1921Nobel Prize in Physics “for his services to theoretical physics, and especially for his discovery of the law of the photoelectric effect （光 电效应）”.The latter was pivotal in establishing quantum theory（量子）