Physics

Physics

Problem

Light of intensity

0.5\,\text{W m}^{-2}

and frequency

5.0\times10^{14}\,\text{Hz}

falls normally on a photo-cathode of area

2.0\,\text{cm}^{2}

. If the quantum efficiency is

25\%

, estimate the saturation current. (Use

h = 6.63\times10^{-34}\,\text{J s}

,

e = 1.6\times10^{-19}\,\text{C}

.) a)

6.0\,\mu\text{A}

b)

48\,\mu\text{A}

c)

12\,\mu\text{A}

d)

3.0\,\mu\text{A}

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