*Question E6F02:
What happens to photoconductive material when light shines on it?*  

*Correct Answer is  A: Resistance decreases*  

### AI Response: (may contain errors)  

When light shines on a photoconductive material, its electrical properties change due to the interaction with photons. Here's a breakdown of the correct answer and why the other choices are incorrect:

1. **Correct Answer: Resistance decreases (Choice A)**
   - **Explanation**: Photoconductive materials have a property where their electrical resistance decreases when exposed to light. This happens because the photons in the light provide energy to the electrons in the material, allowing them to move more freely. As more electrons become available for conduction, the material's resistance decreases.

2. **Why the Other Choices are Incorrect:**
   - **Choice B: Resistance increases**
     - This is incorrect because the exposure to light actually provides energy to the electrons, increasing their mobility and thus decreasing resistance, not increasing it.
   - **Choice C: Reflectivity increases**
     - Reflectivity is not directly related to the photoconductive effect. Photoconductivity primarily affects electrical properties, not optical properties like reflectivity.
   - **Choice D: Reflectivity decreases**
     - Similar to Choice C, reflectivity is not the primary change occurring in photoconductive materials when exposed to light. The main effect is on electrical resistance, not reflectivity.

In summary, when light shines on a photoconductive material, the key effect is a decrease in resistance due to increased electron mobility. This is a fundamental property of photoconductive materials and is crucial for understanding their behavior in electronic applications.