What happens to photoconductive material when light shines on it?
The correct answer is A: Resistance decreases. What happens to photoconductive material when light shines on it is that resistance decreases. Light increases conductivity in photoconductive materials. For amateur radio operators, this is important for optoelectronics knowledge. Understanding this helps when working with photoconductive devices.
Exam Tip
Photoconductive material with light = resistance decreases. Think 'P'hotoconductive = 'P'hotons 'C'onduct (resistance decreases). Light increases conductivity in photoconductive materials. Not increase, not reflectivity - just resistance decreases.
Memory Aid
"Photoconductive material with light = resistance decreases. Think 'P'hotoconductive = 'D'ecreases resistance. Light increases conductivity in photoconductive materials. Important for optoelectronics knowledge."
Real-World Application
Photoconductive material when light shines on it: The resistance decreases. Light creates charge carriers, increasing conductivity and decreasing resistance. This is what happens - resistance decreases.
Key Concepts
Why Other Options Are Wrong
Option B: Incorrect. Resistance increases isn't correct - photoconductive materials decrease resistance when illuminated. Increase is wrong.
Option C: Incorrect. Reflectivity increases isn't what happens - resistance decreases. Reflectivity isn't the effect.
Option D: Incorrect. Reflectivity decreases isn't what happens - resistance decreases. Reflectivity isn't the effect.
题目解析
The correct answer is A: Resistance decreases. What happens to photoconductive material when light shines on it is that resistance decreases. Light increases conductivity in photoconductive materials. For amateur radio operators, this is important for optoelectronics knowledge. Understanding this helps when working with photoconductive devices.
考试技巧
Photoconductive material with light = resistance decreases. Think 'P'hotoconductive = 'P'hotons 'C'onduct (resistance decreases). Light increases conductivity in photoconductive materials. Not increase, not reflectivity - just resistance decreases.
记忆口诀
Photoconductive material with light = resistance decreases. Think 'P'hotoconductive = 'D'ecreases resistance. Light increases conductivity in photoconductive materials. Important for optoelectronics knowledge.
实际应用示例
Photoconductive material when light shines on it: The resistance decreases. Light creates charge carriers, increasing conductivity and decreasing resistance. This is what happens - resistance decreases.
错误选项分析
Option B: Incorrect. Resistance increases isn't correct - photoconductive materials decrease resistance when illuminated. Increase is wrong. Option C: Incorrect. Reflectivity increases isn't what happens - resistance decreases. Reflectivity isn't the effect. Option D: Incorrect. Reflectivity decreases isn't what happens - resistance decreases. Reflectivity isn't the effect.
知识点
Photoconductive material, Light shines on it, Resistance decreases
Verified Content
Question from official FCC Extra Class question pool. Explanation reviewed by licensed amateur radio operators.