# Tagged Questions

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-...

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### What is the Meaning of the Superposition Principle

I am a bit confused as to what the superposition principle actually means. Does it merely mean that you can express any given state as the linear combination of two vectors? If so, isn't that kind of ...
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### Measured Polarization for a Single Photon

I understand that for a given beam of light, it can exist in any number of polarizations. However, I have been told that given a single photon, it can only exist as horizontally or vertically ...
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### Transforming Qubits Into Bits

From what I understand, a qubit exists in a superposition of states and once it has been measured, it must fall into one of the two possible states. Now, I have been told that once a qubit is measured,...
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### What does it mean to say exchange “force” is not really a force?

If I understand it a bit the standard answer for this is: the pushing/holding apart of fermions and the pulling/holding together of bosons is just a result of symmetrization requirement (Griffths' ...
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### Quantization of energy in semi-infinite well

Consider an electron with total energy $E>V_2$ in a potential with $$V(x)= \begin{cases} \infty & x< 0 \\ V_1 & 0< x< L \\ V_2 & x>L \end{cases}$$ ...
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### Time-dependent perturbation theory [closed]

In time dependent perturbation theory there is a group of states having energies nearly equal to initial state.what will be time dependence of probability of finding system in any of such state? Plz ...
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### What magnetic quantum no. Actually represent? [closed]

If azimuthal quantum no. i.e l=3 then magnetic quantum no be -3,-2,-1,0,1,2,3. What does it represent?
According to Pauli "no two electrons in an atom can have the same values for all the four quantum numbers" but if we take any atom with $n=2$ and its 2nd subshell i.e 2p(that contain 3 orbitals) ...