Question
The Einstein’s photo$-$electric equation is based upon the conservation of:

Answer

Einsteins photoelectric equations states that
$E_{k }​= hν − \phi$
where, $E_k​$ is maximum kinetic energy of emitted photoelectrons
$h$ is plank's constant.
$ν$ is frequency of incident light
$\phi$ is work function of metal.
So, it is clearly based upon energy conservation.

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