Recent content by Tazerfish

Summary: I would like to know your favorite (freely accessible) resources and exercises. Preferably not ordered by topic, university (bachelor) level and requiering some creative thinking/ no overly tedious calculations. I was not sure where to put this, feel free to place this thread in...

I am not convinced of that. I would expect the smudges to be too large to actually cause significant diffraction patterns. Additionally, polarising filters work by a different principle as far as I know.They don't absorb light along the lines of a grid spatially but absorb light of one specific...

We can use the equation as an approximation. There will be frictive losses which you could represent with an extra term on the right, but we don't know how big they will be and in most cases, friction is fairly negligible As to your previous question, obviously the ball won't accelerate. It...

Thanks, that was very helpful :D I am a big fan of arm waving electrical explanations :biggrin:

But isn't gravity a bit of a disanalogy in this case ? I don't know what you mean by "long distance" approximation. You could just as well use this formula ## a= \frac{GM}{r^2} ##. Without considering relativistic effects you would be done at that point. No approximations needed.It would be...

When solving the differential equations for an electromagnetic wave you get out that the electric and magnetic field oscillate in phase. But when considering a oscillating dipole, the electric and magnetic field at a point close to the dipole are a quater period out of phase. Can someone please...

In an ideal monoatomic gas, temperature and kinetic energy are proportional.That is true. But that is one specific case. And such a neat relationship is (to my knowledge) only true for very specific cases. Once you introduce rotational and vibrational motions of the gas molecules you get a...

1.Yes. The carnot efficiency will always be below 100 percent.And a realistic efficiency will always be smaller than the carnot efficiency. But that seems a bit trivial, to be honest. Your second and third question can probably be answered if you read the articles of the terms on hyperphysics...

OK. I think this is sort of solved now (not really, but the general process has likely been identified): My teacher found an old book which talked about the "striations"(cool name btw). The explanations using overtones seem to be a common misconception. They supposedly form due to circulation...

Interesting idea(both the harmonics and the ISS experiment). I searched for some footage where they put a microphone, hooked up to an oscilloscope, into the tube and look out for the harmonics. Here is some footage . There are some glitches and irregularities but I don't think it is enough.(with...

Yes, exactly. Would you know more about that ? EDIT:In my earlier posts, I forgot to mention that, the Wikipedia article attributes the motion of the particles to an effect called acoustic streaming, in which the absorption of sound (in the boundary layer) somehow produces a net flow. But I...

I do understand what you were talking about with the string and how it applies to the motion of the dust. However, I still do not have a specific and plausible explanation for why this motion would cause the "walls" to form. What is making these patterns stable ? Why does the top of the "wall"...

Don't be sorry.It was easy enough to miss. This bit: was a slighly confusing to read. I don't really understand how that would explain the stripes. I think i get it now... Let me rephrase it : When suddenly turning the sound off, some of the material leaves the lumps at the nodes and deposits...

That does not explain the "walls" or stripes. I am specifically talking about the buildup of thin vertical structures in the ANTI-nodes. Not the general lumping in the node. It may be of help to note that these structures are usually far smaller (about an order of magnitude) than the space you...

To get this out of the way: I know how a kundt's tube generally works and how you can use it to determine the speed of sound. For anyone who hasn't heard of it, you take a tube and "feed" it a resonant frequency.(very similar to a rubens tube) The nodes of the resulting standing wave in the...