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Physics Forums's title: Physics Forums | Science Articles, Homework Help, Discussion

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Can Mathematical Models Explain Scenes from The Day the Earth Stood Still?
This model diagram is possible when index0/index1=index1/index2=radius2/radius1 for the model's variables. 30 degree wave into a sphere. Reminded me of something out of that old science fiction movie, The Day the Earth Stood Still...


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How can light be a wave and particle at the same time?
I don't even have enough education in physics to even be considered a novice. And this might be a 'duh' observation. To begin with consider that we don't properly conceive what light really is. We define it in ways that we can work with it. What we define could just be like shining a...


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How best to learn? How to get 100%?
Homework Statement: I see people saying to understand concepts instead of memorizing.
Relevant Equations: Barely gonna start calculus-based physics. My question is how do i understand concepts and when do i know i have understood them fully? I would like a step by step to this with...


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Calculating Electron Yield by Photon Saturation in MCNP
How to check the the saturation limit of electron yield by gamma photon incident on a metal sheet using mcnp. As I know that mcnp give result per Particle , but how can I check the final saturation limit of that metal. Is it possible to check it for different numbers from 10e6 to 10 e12 to see...


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Long rod in orbit
Lets suppose we could place a long rod in orbit, at the distance of Moon.
Which would be the stabile position of the rod, perdendicular to the orbital path, or parallel to it?
I think parallel, to minimize tidal forces between the two opposite parts of the rod.

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