Video - Photoelectric Effect and The Einstein Formula Simply Explained

The Planck's constant \( h \) is a physical constant that appears in equations whenever the equation describes quantum phenomena. For example, it appears in the light quantum hypothesis:

Formula anchor$$ \begin{align} W_{\text p} ~=~ h \, \class{violet}{f} \end{align} $$

In this equation Planck's constant connects the energy \( W_{\text p} \) of a photon (light particle) with the light frequency \( f \). From this equation you can also read the unit of the Planck's constant, if you rearrange the equation for \(h\): Js (Joule seconds).

You can measure the value of the Planck's constant, for example, using the photoelectric effect. It has the value:

Value of the Planck constant

Formula anchor$$ \begin{align} h ~=~ 6.626 \, 070 \, 15 ~\cdot~ 10^{-34} \, \mathrm{Js} \end{align} $$

+ Perfect for high school and undergraduate physics students + Contains over 500 illustrated formulas on just 140 pages + Contains tables with examples and measured constants + Easy for everyone because without vectors and integrals