The kinetic energy of the released electron in photoelectric effect depends on
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Remember:
\[
K_{\max}=h\nu-\phi.
\]
\[
\text{Frequency } \rightarrow \text{controls kinetic energy}
\]
\[
\text{Intensity } \rightarrow \text{controls photoelectric current}
\]
This is one of the most important results of Einstein's photoelectric theory.