= Photoelectric effect
{tag=1921 Nobel Prize in Physics}
{wiki}
No matter how hight the wave intensity, if it the frequency is small, no photons are removed from the material.
This is different from classic waves where energy is proportional to intensity, and coherent with the <photon>[existence of photons] and the <Planck-Einstein relation>.
\Video[https://www.youtube.com/watch?v=22RSoYpazao&list=PLGImELmE_zlPqmRbbvZ1MjWnbFovcwBBO&index=96]
{title=Photoelectric effect by <UCSB Physics Lecture Demonstrations> (2021)}
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