Recent content by Nosebgr

A Design for a Quantum Time Machine Andrew Gray, submitted 2 Apr 1998 ABSTRACT "In the new ``History Selection'' formulation of Quantum Mechanics an entire cosmic history is selected over all space and time, with a probability for selection assigned to each possible history. As this...

For a particle's wavefunction to have a nonzero value at a region where the potential is infinite would suggest that there is a nonzero probability amplitude associated with finding that particle in the region. How can a particle with finite energy exist in a region of space with infinite potential?

So...? That doesn't mean Pauli Matrices are the connection between the two vector spaces. They relate spin states, which are defined in the two dimensional Hilbert space, with our three dimensional space through acting on the spin states and producing the eigenvalues. The eigenvalues relate to...

That is not necessarily a correct statement. Pauli matrices exist in their two dimensional Hilbert space, and they do not form a direct link with our own three dimensional real space. The connections they form are between one spin state and another, which all exist in the two dimensional complex...

Ok, I see now. The receptors in the eye - or a receiver, either way - doesn't necessarily sense / detect purely according to the number of photons. They would respond to the intensity - the rate of power transferred from a particular source. Then, both LED's would theoretically light up at the...

Why not? Intuitively that's how I always pictured it - assuming the angle at which the photons meet the eye are equal.

In hindsight, perhaps I should have phrased it better. When I said "intensity", I meant it purely in terms of the photon density. I shouldn't have said intensity, because by definition it is the power per unit area. If we feed any two LED's the same power, regardless of their colour, the output...

You should not think of spin states as actual vectors in our three dimensional space. I suggest you do some readig on the subject, if you can derive the eigenstates using the pauli matrices you can gain rather valuable intuition. Here is a wiki link in case you just want to see what the states...

Incandescent light bulbs emit light as a result of heat. We can treat the bulb as a black body source. The question you ask is really specific, I will answer according to my intuition however if I am mistaken feel free to correct. A black body source emits light as a result of collisions...

Alternate way of thinking (engineer's approach): Power = Voltage x Current. If you have a simple circuit that consists of a battery, an LED and a resistor, you can adjust the power output/consumption by changing the value of the resistor. Since LED's have negligible resistances, the power...

I don't quite understand the question here, please let me know if your question is different than the one I'm about to answer. The complex conjugate of a ket vector is defined to be the corresponding bra vector, therefore K|a> would be equal to <a|. Just take the complex conjugate and turn the...

Homework Statement Consider a spin state |n; +> where n is the unit vector defined by the polar and azimuthal angles θ and φ and the spin state |n'; +> where n' is the unit vector defined by the polar and azimuthal angles θ' and φ'. Let γ denote the angle between the vectors n and n': n⋅n' =...

It depends. If you are working with particles traveling at relativistic speeds, then you would need to use the relativistic equation. For particles traveling at velocities much smaller than the speed of light, then you can use the Newtonian approximation. If you want, you can compare the results...

What "force" are you asking about? If you are asking about the induced magnetic field through the solenoid, then it depends solely on current. The equation is given by: B = μ n I, where μ is the magnetic constant (permeability of free space), n is the number of turns per unit length (turn...

Intensity is defined as Power / Area. Therefore you can simply think of intensity as being correlated to the number of photons hitting at a surface in a given time period. Also, it depends on the frequency of the photons, since higher frequency photons are more energetic. I can't think of a...