alleryIn the photoelectric effect, the kinetic energy of the ejected electron depends on
Athe intensity of the incident light
Bthe frequency of the incident light
Cthe colour of the metal surface
Dthe temperature of the metal
Answer & Solution
Correct answer: B. the frequency of the incident light
$KE_{max} = h\nu - \phi$ where $\phi$ is the work function.
KE depends only on *frequency*
intensity only changes the *number* of ejected electrons, not their energy.
This is Einstein's resolution of the photoelectric puzzle.
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