When the experiment looks at the overall effect of light, light appears to be composed of particles. On the other hand, if it looks at specific parts of the whole, light appears to be a wave.
至於一種能量會以「波」還是「粒子」呈現，完全看科學家的實驗設計：當實驗機轉偏向整體表現時，「粒子」的特性就顯著，反之，若偏向局部表現時，就會呈現「波」的特性。