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  3. 1 among the four atomic diffusion mechanisms what mechanisms can...

Question: 1 among the four atomic diffusion mechanisms what mechanisms can...

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1. Among the four atomic diffusion mechanisms, what mechanisms can assist atomic self-diffusion and what cannot? (10 points) 2. Why is atomic diffusion called a thermal activation process? What does the thermal activation energy represent? How does the diffusion rate depend on temperature? (15 points) 3. Heat conduction is a form of exchange in kinetic energy through mutual collisions between microscopic particles. Based on this energy exchange mechanism, please roughly compare the conductivity of gas, liquid and solid. According to your comparison, can you predict what kind of material form produces good thermal insulators? (15 points) 4. How to choose the material surfce to maximize and minimize the heat loss by radiation? (10 points)

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