What term refers to the alteration of materials by exposure to light, especially ultraviolet light?

What term refers to the alteration of materials by exposure to light, especially ultraviolet light?

• A. Photosynthesis
• B. Photodegradation
• C. Photolysis
• D. Photochemical Reaction

Answer: (D)

Photodegradation is the term that describes the alteration of materials by exposure to light, especially ultraviolet light. When materials like plastics, paints, or dyes are hit by UV photons, the energy can initiate chemical reactions that break bonds or form reactive species. Over time, these changes weaken the material, cause color fading, surface cracking, or embrittlement. Photodegradation focuses on the outcome — the deterioration of material properties due to light exposure. Photolysis, by contrast, refers to the specific process of breaking chemical bonds with light; it’s a mechanism that can contribute to degradation but doesn’t by itself mean the material is deteriorating in a broad sense. A photochemical reaction is any reaction driven by light, which is a general category that can include many processes beyond material aging. Photosynthesis is unrelated to material alteration; it’s the process by which plants convert light energy into chemical energy.

Photodegradation is the term that describes the alteration of materials by exposure to light, especially ultraviolet light. When materials like plastics, paints, or dyes are hit by UV photons, the energy can initiate chemical reactions that break bonds or form reactive species. Over time, these changes weaken the material, cause color fading, surface cracking, or embrittlement.

Photodegradation focuses on the outcome — the deterioration of material properties due to light exposure. Photolysis, by contrast, refers to the specific process of breaking chemical bonds with light; it’s a mechanism that can contribute to degradation but doesn’t by itself mean the material is deteriorating in a broad sense. A photochemical reaction is any reaction driven by light, which is a general category that can include many processes beyond material aging. Photosynthesis is unrelated to material alteration; it’s the process by which plants convert light energy into chemical energy.