1,476 reputation
512
bio website marty-green.blogspot.com
location Canada
age
visits member for 4 years, 3 months
seen 7 hours ago

Jul
30
answered How is this possible that photons are absorbed?
Jul
20
comment What's wrong with this argument that aerodynamic lift really does rely on Bernoulli?
@Dunlavey And yes, I've been a big fan of the John Denker website since I first saw it about ten years ago.
Jul
20
comment What's wrong with this argument that aerodynamic lift really does rely on Bernoulli?
The wing pushes air down because of the angle of attack. But I don't know any way to calculate exactly HOW MUCH air gets pushed down, either from the angle of attack or by some kind of Bernoulli's Principle analysis. But assuming that the wing is actually functioning properly (not stalling or anything like that) I think you'd get a pretty good estimate by multiplying the effective cross section by the velocity of the airplane.
Jul
19
answered What's wrong with this argument that aerodynamic lift really does rely on Bernoulli?
Jun
24
answered Relation between power & thickness of the filament
Apr
23
awarded  Yearling
Mar
30
comment Why do lines in atomic spectra have thickness? (Bohr's Model)
Thanks for the edit, Noah. And thanks for my first lesson in LATEX. Now I know that the code for 10^(-8) is DOLLARSIGN\ 10^{-8}DOLLARSIGN (with actual $'s instead of DOLLARSIGN).
Mar
30
awarded  Custodian
Mar
30
reviewed Approve Why do lines in atomic spectra have thickness? (Bohr's Model)
Mar
29
answered Why do lines in atomic spectra have thickness? (Bohr's Model)
Mar
21
comment Can quantum fluctuation happen outside space-time?
It's easy to make fun of an outsider who asks this kind of question. But it seems to me that serious physicists are responsible for the claim that "the big bang was the result of some kind of quantum fluctuation". If that's the kind of statement that legitimate physics deals with, then I really don't see what's wrong with the question. Because it's about as meaningful as the statement which inspired it.
Mar
20
comment How wrong are the classical Maxwell's equations (as compared to QED)?
Thanks, @FraSchelle. What is especially baffling is that more than 100 years into the new paradigm that is quantum physics, I am still considered a kook on the internet for drawing attention to these obvious and readily verifiable truths.
Mar
11
comment How wrong are the classical Maxwell's equations (as compared to QED)?
You didn't answer my question, Jerry. Am I right about the black body radiation, the atomic spectra, and the laser?
Mar
11
comment How wrong are the classical Maxwell's equations (as compared to QED)?
Oh come on. You get the wrong answer when you apply Maxwell's Equations to orbiting electron because you're using the wrong model for the hydrogen atom. There's nothing wrong with Maxwell's Equations. When you apply them to the Schroedinger atom instead of the incorrect Bohr atom, you get the right answer for the spectral lines and the linewidths.
Mar
11
comment How wrong are the classical Maxwell's equations (as compared to QED)?
I think in the first paragraph where I said you don't need to quantize the energy, I meant the e-m field energy. You still get discrete energy levels in the mechanical system when you solve the Schroedinger equation. Those states have stationary charge distributions. But any system in a superposition of those discrete states will have an oscillating charge density, and that oscillating charge emits and aborbs radiation strictly according to classical antenna theory.
Mar
10
comment How wrong are the classical Maxwell's equations (as compared to QED)?
So are you agreeing that I'm right about the black body spectrum, the atomic spectra, and the laser?
Mar
10
answered How wrong are the classical Maxwell's equations (as compared to QED)?
Feb
18
comment Calculate the approximate number of conduction electrons
I agreed with Sofia that JohnRennie's comment was a good answer...it helped ME understand how to do the question. I actually thought he put too much detail in the actual answer which he subsequently posted. I think he could have literally put his comment down as an answer, because it's a homework question and it points the way to the solution.
Feb
7
answered How much of the energy of a car is required for overcoming air resistance?
Jan
28
answered The storage of kinetic energy in a flywhell?