750 reputation
311
bio website dropletsforming.blogspot.com
location England, United Kingdom
age 32
visits member for 4 years
seen yesterday

Dec
8
comment Electromagnetic waves should stop while encountering a conducting shell?
I've added a little information on surface plasmon resonance, but if you have more questions, please do post a new question to attract good answers!
Nov
28
comment A question about motion and time dilation
@user43783: Congratulations, this is what General Relativity is all about. Begin by remembering that there is no absolute position, and no absolute time.
Nov
25
comment Why does iron sink in molten iron instead of floating?
I think your densities are wrong. At present you have a higher density of ice at 0 C, which would make it sink.
Sep
30
comment Correct approach for calculating excited states of circular quantum dot under effective mass approximation
I've added the equation, explanation, paper details and fixed the title so that people can see what it's about.
Sep
15
comment How does an electron move around in an orbital? Is it “wave-like” or random?
FYI, calculating the surface within which there is 90% probability is actually quite challenging unless the orbital is really simple and analytic. So usually what is plotted is just an isosurface on which the probability density is at a given figure, because that's much easier.
Jul
23
comment Is speed of light and sound rational or irrational in nature?
Regarding rationality of numbers in measurement, David Z's answer is spot on. If you are trying to grasp whether the universe prefers integers, then yes it does. Things like the resonance frequencies of strings are in strict integral relationships (f, 2f, 3f, 4f). Quantum physics is also based on integers; the idea of quanta itself is that nature is lumpy rather than continuous.
Jul
10
comment Classic home experiments for an 8-year-old child
Exactly. That's one of the things that I feel makes for a good learning experiment; there is space for multiple hypotheses, and people usually get it wrong the first time. I remember being sure it would miss, partly because it seemed impossible to hit it every time. Ping. Clatter. Gasp!
Jul
9
comment Classic home experiments for an 8-year-old child
Yes. The narrative is intended to point out that the gun is pointed directly at Kiki. The usual intuition mistake is to assume that bullets do not fall like any other projectile, or to ignore it. The set-up with the monkey letting go as the gun fires is supplying a separation of the motion vector. Clearly for a real gun to function correctly, its targets must compensate for the motion of the bullet.
Jul
9
comment Would a craft travelling increasingly close to the speed of light appear to be decelerating?
True, and this is the basis of many 'paradox' explanation articles. The question, however, was how it would appear to an observer, not to the traveller. To the observer watching someone accelerate near c, it is still an acceleration. Just because you move at some speed relative to me, it does not change my experience of time.
Jul
4
comment Does serving food on a hot plate really keep it warm longer?
Extract from the lab diary: "Trial 1, Apparatus: Roast chicken dinner (plate at 21.3deg), dining table, knife and fork..."
Jul
1
comment Effective mass of a particle
It can also be anisotropic (for example in Silicon)
Apr
9
comment Force between two charged particles
To clarify, do you have 2 charges (q0 and q1) both on the y axis, separated by distance d1?
Apr
8
comment multibody problem and determinism
I'm not confusing them, they are the same thing. We see from the double slit experiment that making the result deterministic changes the very probabilities of the evolution of the system. I'm probably not explaining it very well. Many worlds just says that the mechanism of multiple states evolving simultaneously is deterministic; i.e. the universe bifurcates at every instant. But it does not give an answer on how or why recombination happens. Yet some prefer it because it takes one of the question marks away (at the cost of adding an infinitely bifurcating universe).
Apr
8
comment multibody problem and determinism
I would say it is generally accepted. As we can only falsify non-determinism (i.e. we cannot prove that something has no cause, only that none has been found), there will always be some who dislike the idea of something unseen deciding whether the cat lives or not. However, unless you are in the field of many-worlds theories and so on, it is immaterial what you believe; the equations give you the non-determinism you will have to deal with. The most broadly accepted interpretation (Copenhagen) is that we do not know what happens in the midst of an interaction, only that it follows our equations
Apr
8
comment Does interference take place only in waves parallel to each other?
@rahulgarg12342: Hmm. The first is meant to show how the path difference varies over the plane, and the second is supposed to show how that results in reinforcement or dampening of the resulting waves, including where the dead zones are. If you understand that, how would you describe it? If not, how far do you follow it? Cheers!
Apr
8
comment Does interference take place only in waves parallel to each other?
@rahulgarg12342: Is the edited answer understandable? When you say 'interference', do you mean destructive (cancelling out) effects or constructive (reinforcing) effects? Interference really covers both, it just means a pattern resulting from two waves interacting.
Apr
8
comment Does interference take place only in waves parallel to each other?
@ParthVader: I had gone down a bit of a rabbit hole, but hopefully the edited answer is a better fit.
Apr
7
comment Does interference take place only in waves parallel to each other?
I've added something hopefully clearer at the top, might get a chance to illustrate it a bit later.
Apr
7
comment Does interference take place only in waves parallel to each other?
I'm saying that as you slide one wave next to the other, you increase the phase difference and go smoothly from making the wave bigger to making it smaller and eventually zero. Moving it further it becomes bigger again, in a cycle.
Mar
12
comment How do we perceive colors outside our gamut?
I see what you're saying now, I didn't get any of that from the answer. Also interesting might be perception of blue without perceiving red, as red cones have a blue peak as well; this could be what we call violet.