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6h
comment How does one detect a single photon?
I've never really believed that video was an actual experiment. I think it's just a computer simulation.
16h
answered How does one detect a single photon?
1d
comment Density Matrix representation of excited atoms
I am not sure that it is in the true spirit of the density matrix theory to require that one of the atoms in an ensemble be identifiable from the others, as it is when you say "let us assume it is the first atom which is in the excitied state". And the same goes for distintuishing the two systems experimentally. If you know which atom is excited, yes you can presumably measure its energy. But how do you look at a bottle of 1o0 hydrogen atoms and say THIS one is in the p state and that's the one I'm going to measure?
2d
comment Density Matrix representation of excited atoms
Yes. So roughly speaking, 0.995|s> + 0.1|p>
2d
asked Density Matrix representation of excited atoms
May
1
answered Calculating the expectation value of spin
Apr
23
awarded  Yearling
Apr
20
comment Trying to understand the EPR paradox
Yes it is true that Bell's inequality excludes these more subtle possibilities. But no one believes that those far-fetched possibilites are physically plausible. For the basic behavior of a spinor particle, whose state is defined by the superposition of spin-up and spin-down components, the 100% correlation remains the true paradox and the only paradox.
Apr
17
awarded  Nice Answer
Apr
16
comment Are eductors working on the Bernoulli principle?
for the outlet, true: but the pressure in the suction chamber can be quite low.
Apr
16
comment Are eductors working on the Bernoulli principle?
And you don't need a supercomputer to figure that out.
Apr
16
comment Are eductors working on the Bernoulli principle?
Yes, you're right about that. I've had lots of discussions about this and I agree with you about the airplane wing. I have only one really good argument for the venturi effect. If you have water in a pipe, and there is a venturi, you agree that the water is flowing faster at the constriction. So it speeds up, and then it slows down. If it slows down, it is decellerating, and there is F=ma to make it slow down. The only force is (pressure)x(area). So the pressure must be higher downstream.
Apr
16
answered Are eductors working on the Bernoulli principle?
Apr
9
answered Why does the current in a purely capacitive AC circuit lead the voltage by 90 deg?
Apr
3
answered Wave-like description of Compton scattering and photoelectric effect
Mar
7
comment Is a heated tungsten filament in a “pure state” or a “mixed state”?
@emilio, I am concentrating on your arguments because I think everyone else is an ignoramus who actually believes that the charge density is stationary in the tungsten filament. But a careful reading of everything you have said convinces me that you know I am right, and you have known it from your very first entry when you chose to attack my spelling mistakes instead of my physics; that of course there is a time-varying charge density, but you are using sophistry and mathematics to throw me off.
Mar
7
comment Is a heated tungsten filament in a “pure state” or a “mixed state”?
I am not confused.
Mar
7
comment Is a heated tungsten filament in a “pure state” or a “mixed state”?
Do you believe that the charge is stationary in a hydrogen atom which is in a superposition of the 1s and 2p states? Or do you agree with me that it is oscillating?
Mar
7
comment Is a heated tungsten filament in a “pure state” or a “mixed state”?
I don't care how many PhD's you people have. It is absurd to suggest that in QM, the "average" charge density in a glowing filament is stationary. It's just absurd. I don't know how anyone can believe it.
Mar
7
comment Is a heated tungsten filament in a “pure state” or a “mixed state”?
The average charge distribution of EVERYTHING is constant. That is just meaningless. A hydrogen atom in the superposition of 1s and 2p is oscillating rapidly, but the AVERAGE charge distribution is stationary. You don't use the AVERAGE charge to calculate radiation, you use the exact time-varying charge.