Skip to main content

Illustration Classically forbidden / allowed region

Classically forbidden / allowed region
Classic forbidden/allowed regions
Download

Share โ€” copy and redistribute the material in any medium or format

Adapt โ€” remix, transform, and build upon the material for any purpose, even commercially.

Sharing and adapting of the illustration is allowed with indication of the link to the illustration.

Harmonic potential energy function \(W_{\text{pot}}(x)\) with sketched total energy \(W\) of a particle. Classically the particle always has a positive kinetic energy:$$ W_{\text{kin}} ~=~ (W_{\text{pot}} - W) > 0 $$Here the particle can only move between the turning points \(x_1\) and \(x_2\), which are determined by the total energy \(W\) (horizontal line). It is the classically allowed region (blue).

Negative kinetic energy is not physically possible:$$ W_{\text{kin}} ~=~ (W_{\text{pot}} - W) < 0 $$

It is the classically forbidden region (red).