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# IllustrationSquared magnitude of a wave function (example)

Level 3
Level 3 requires the basics of vector calculus, differential and integral calculus. Suitable for undergraduates and high school students. Share — copy and redistribute the material in any medium or format

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This illustration is free to use with indication of the copyright: universaldenker.org

Squared magnitude $$|\mathit{\Psi}|^2$$ of the wave function of a particle in the infinite potential well (for $$n=3$$):$\mathit{\Psi}(x) ~=~ \sqrt{\frac{2}{L}}\sin\left(\frac{3\pi}{L}\,x\right)$

The area under the $$|\mathit{\Psi}|^2$$ is the probability. The probability between the points $$x=a$$ and $$x=b$$ is given by$P ~=~ \int_{a}^{b} |\mathit{\Psi}|^2 \, \text{d}x$

The particle is most likely to find at the maxima of the function and most unlikely at the minima. The total area is 1 (normalization condition).