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Semiclassical descriptions involve a base/background part described classically, and quantum parts representing an effective development in powers of Planck's constant, ħ. They cover systematic approximations such as the WKB, intuitive approaches to the correspondence limit, and a broad class of interstitial physical phenomena.

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Show that angular momentum is independent of the angle

The $1/r$ potential interaction is, fundamentally, the same as what's in gravitationally orbiting bodies. How do you prove that $L$ is constant for those? (a couple of videos on the topic that might b …
Sean E. Lake's user avatar
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Do Maxwell's equation describe a single photon or an infinite number of photons?

Because photons do not interact, to very good approximation for frequencies lower than $m_e c^2 / h$ ($m_e$ = electron mass), the theory for one photon corresponds pretty well to the theory for an inf …
Sean E. Lake's user avatar
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How can I use a magnet to lift a paperclip?

It's true that the Lorentz force can do no work. As others have pointed out, a non-uniform magnetic field can do work on intrinsic dipoles. I feel something else should be pointed out, too: the magnet …
Sean E. Lake's user avatar
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