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Quantum mechanics describes the microscopic properties of nature in a regime where classical mechanics no longer applies. It explains phenomena such as the wave-particle duality, quantization of energy and the uncertainty principle and is generally used in single body systems. Use the quantum-field-theory tag for the theory of many-body quantum-mechanical systems.

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I'm trying to understand the reason for Heisenberg's uncertainty principle which I read is a "fact of nature" rather than an experimental limitation. I found this thread in which the accepted answer t …
asked Jul 13 '16 by Weezy
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3answers
In the experiment where electrons are sent one by one through a slit on a screen behind which there is an electron detector, the electron is said to have a definite position at the time it crosses the …
asked Dec 20 '15 by Weezy
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Many videos on YouTube while discussing black holes mention that it's born out of a heavy star when it collapses into a single point and that infinitely curves spacetime around it. When all the mass …
asked Jan 3 '16 by Weezy
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3answers
From a video lecture on quantum mechanics at MIT OCW I found that you didn't need to know Schrödinger's equation to know the momentum operator which is $\frac{\hbar}{i}\frac{\partial}{\partial x}$. Th …
asked Nov 22 '15 by Weezy
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can we assume that a photon equals one wavelength for example if we have a light with wavelength equal to 700nm, one photon of that light will have energy =2.84×10−19J. No. A photon is a quantum …
answered Dec 20 '15 by Weezy
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In any interference experiment, whether it be an unequal arm length interferometer or the classical double slit set up, we have two unequal distances from source (or slits) to screen/detector. Single …
asked Jul 18 '17 by Weezy
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The answer must be yes but I have trouble dealing with the explanation given here. As you can see the light is polarized at an angle theta to x axis. After it passes the polarizer A which is along x …
asked Oct 17 '15 by Weezy
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This is not a complete answer but the condition: $A_{nm}=a_{n}\delta _{nm}$ implies that the matrix is diagonalized and from wikipedia: An $n\times n$ matrix $A$ over the field $F$ is diagonaliza …
answered Oct 23 '16 by Weezy
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If n=even, $A = -B$ so you have $\Psi=A[e^{ikx}-e^{-ikx}]$ which is nothing but $2Asin(kx)$ where $k=\frac{n \pi }{L}$ Similarly for n=odd you have $A=B$ and $\Psi=A[e^{ikx}+e^{-ikx}]$ and $2Acos(kx)$ …
answered Aug 13 '16 by Weezy