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location Cologne, Germany
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visits member for 3 years, 7 months
seen 29 mins ago

Functional programming enthusiast, audio engineer & musician. Whilst not busy with any of that, I study physics at Universität zu Köln / Bonn-Cologne Graduate School.


Nov
9
awarded  Explainer
Nov
9
revised What influences the intensity of a wave? Frequency vs Amplitude
added 475 characters in body
Nov
9
answered What influences the intensity of a wave? Frequency vs Amplitude
Nov
9
revised What influences the intensity of a wave? Frequency vs Amplitude
added 14 characters in body
Nov
6
answered Wavefunction, probability and impossible events
Nov
1
comment The sound of rotating helicopter blades
Spherical helicopter in frictionless vacuum, please!
Oct
9
comment Does the commutator of anything with itself not vanish?
@user121330: what do you mean? Sure, composition of linear operators doesn't commute in general... otherwise there would be no reason to ever consider the commutator. But how is this in dissonance with this answer?
Sep
27
comment Hawking (blackbody) radiation, emission or absorption
Why, Hawking radiation has energy leaving the black hole, so it is evidently emission. What exactly is your question?
Sep
24
awarded  Autobiographer
Sep
20
comment Solving equation of motion with exponential friction term
@CuriousOne: at least you're not as lazy as calling anything "nontrivial" if it's not immediately solved by Fourier transform, and proposing to do it numerically...
Sep
20
revised Solving equation of motion with exponential friction term
added 26 characters in body; edited title
Aug
31
revised Why is there a controversy on whether mass increases with speed?
added 927 characters in body
Aug
31
comment Why is there a controversy on whether mass increases with speed?
@BenCrowell: it is an ambiguity if the problem is phrased ambiguously (duh), i.e. if it wasn't properly specified whether both particles should be considered. Yet to the layman it's not obvious that the ambiguity carries over, because in the nonrelativistic case mass is simply additive. Hence the apparent controversy, when really you're just comparing two different situations with results that seem incompatible (but aren't).
Aug
31
comment Why is there a controversy on whether mass increases with speed?
@BenCrowell that still leaves ambiguity if it's not clear what system you consider. For two particles, if you accelerate them in opposite directions, the invariant mass increases. If you only consider one of the particles, it stays constant.
Aug
31
answered Why is there a controversy on whether mass increases with speed?
Aug
24
comment Do low frequency sounds really carry longer distances?
@akrasia: the near-field includes the eardrums (or at least the ear canal: once you're in a waveguide, all works differently anyway!). That's basically all that's relevant here, and it follows easily from the effective size of the diaphragm: larger than the distance to the ears. Ear-plugs are right in the ear canal themselves, so for those it's obviously true.
Aug
18
comment Current in purely LR DC circuit at t=0
Possibly this is the right answer (I can't tell because I don't really understand what the OP is asking), but at any rate it's imprecise wording. You don't induce currents, you induce EMFs (voltage). What Lenz's law states is that this voltage is such that the current it causes through a resistor or capacitor is such as to inhibit the change in magnetic flux. Cancelling currents in opposite directions... sure you can somehow interpret stuff like that, but I doubt it's very useful here.
Aug
18
comment Current in purely LR DC circuit at t=0
After closing what switch? If you start with an inductor and a resistor connected only at one terminal, and then connect the other one, the current will obviously start out at zero... and stay at zero forever!
Aug
15
comment Is speed an intensive property?
That's pretty convincing to me, now I read it. Perhaps what I meant to say with my original comment should better have been put "the notion of extensive-ness doesn't make sense for vector quantities", but momentum is evidently extensive, and then there is no good argument why velocity wouldn't be intensive.
Aug
14
comment Is speed an intensive property?
I think intensive vs. extensive only makes any sense for true scalar quantities, while speed is (the magnitude of a velocity-) vector. So it's neither intensive nor extensive.