Short answer questions on Solid state physics

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Platinum appears silver and shiny due to its high reflectivity and metallic luster. Aluminum oxide's color variations, such as transparent, red, or blue, result from different impurities and crystal structures. Quartz is transparent because of its crystal structure, which allows light to pass through without significant scattering. Participants are reminded to provide their own attempts at answering these questions to receive further assistance. Engaging with the material is essential for effective learning in solid state physics.
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1. Platinum is silver and shiny. Why?
2. Aluminum oxide can be either transparent, red or blue. How?
3. Quartz is transparent. Why?
 
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Welcome to the PF. You must show your own attempt at answering these homework/coursework questions before we can provide any tutorial assistance -- that's in the PF Rules link at the top of the page.

So what are your answers?
 
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