# All Questions

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### How do I properly express adding perturbed states to unperturbed states?

I have a problem set due tomorrow, and the last problem is driving me nuts. Been combing through griffiths trying to find similar examples to no avail, so it'd be greatly appreciated if stackexchange ...
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### How do we know what particle we are shooting with lasers?

With the double-slit experiment physicists are shooting particles or even a particle through the form of light, laser. But how do they know specifically what particle they are shooting from this ...
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### Gauss's Law problem [on hold]

I've been thinking about this for a while, but I'm not sure how to proceed. I understand uniform charge-density problems, but the added non-uniform deal makes me uneasy: find the e. field inside a ...
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### How can a singularity in a black hole rotate if it's just a point?

I guess nobody really knows the true nature of black holes, however, based on everything I know about black holes, there is a "singularity" at their center, which has finite mass but is infinitely ...
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### Electric Field: distributed uniformly in one infinity tape of length [on hold]

One charge density surface is distributed uniformly in one infinity tape of length with $2a$ width from distance $d$. Determine the Electric Field in the point perpendicular from the distance $d$ ...
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### If a planet were cut in half but stayed hemispherical, how hot would the ocean on the flat side be?

Some time ago I asked a question about gravity on a hemispherical planet, in preparation for a Dungeons and Dragons game. What would gravity be like on a hemispherical planet? The party now ...
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### Human and Ultraviolet light

As I know, ultraviolet light can be created from burning something at high temperature. So I have a question: Can a human body become a source of ultraviolet light at high temperature? If the answer ...
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### Capacitor in series?

Say you have two charged capacitors in series. Zoom in on one capacitor. For this specific capacitor, the charge on the two plates will be the same in magnitude, according to my textbook. My teacher ...
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### Field inside a wire?

This answer gives a great explanation of why the field inside a wire must be equal at all points: Why doesn't the electric field inside a wire in a circuit fall off with distance from the battery? ...
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### Quantum Wave Mechanics

I am studying QM-I these days. Now, I just think of the wave function as just a mathematical function that defines the state of the particle at an instant and from it you can extract various ...
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### Why is it easier to glide on sharp ice skates than on dull skates?

There have been previous questions (e.g. here and here) on Physics.SE about the mechanism that makes ice skating possible. Reviewing these, as well external references, it seems pretty clear that the ...
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### Can Somebody give me Questions [on hold]

Can someone give me questions on physics because I have my Examination tomorrow Class 9th (CBSE) topic : - Fluids(Density,buoyant Force , Archemedis Principal) , Work Power Energy(Work Basics, ...
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### Intuitiveness of physical processes [on hold]

There are several problems in physics, which defy intuition/ non-rigorous prediction. There might be several reasons for the same; 1) Phase transitions 2) The laws being considered not general enough ...
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### Explain Heat Transfer

I would like to know what are these formulas used for. There is no intro about it in my book at all, and I am reading Heat Transfer book. If needed Q. can be edited.