Question Detail

Threshold frequency (f0) is the minimum frequency of incident light required to eject electrons from a metal surface. It is directly related to the work function (φ) of the metal by the equation φ = hf0, where h is Planck's constant. The work function is a characteristic property of the material itself. Brightness or intensity of incident light affects the number of photoelectrons emitted, not the threshold frequency. The thickness of the metal is not directly related to the threshold frequency.