Which condition must be met for photoelectrons to be ejected from a material surface?

Which condition must be met for photoelectrons to be ejected from a material surface?

A. The threshold frequency is greater than the photon frequency
B. The work function is less than the photon energy
C. The intensity of light is high enough
D. The wavelength of the photon is maximum

Answer: B. The work function is less than the photon energy

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