Part III: Explanation (35 points, You may use English or Chinese in your answer. The whole answer must be less than 500 words.)

     It is known that both the matter and energy exhibit wave-particle duality. Please explain what are the "wave property" and the "particle property". Furthermore, take "light" (electromagnetic wave) as an example and discuss that in what condition it behaves more like an ideal wave and in what condition it behaves more like an ideal particle. Give a real phenomenon to support your discussion. (35 points, answer must be less than 500 words.)