Physics

Problem

Ultraviolet light of wavelength

248\,\text{nm}

falls normally on a sodium surface of area

1.0\,\text{cm}^2

with an intensity of

1.5\,\text{mW}\,\text{cm}^{-2}

. Assuming every incident photon ejects one electron, what is the maximum photoelectric current that can be obtained from this surface? a)

3.0\,\text{mA}

0.30\,\text{mA}

0.030\,\text{mA}

30\,\text{mA}