Monochromatic light of frequency and power falls normally on a photo-cathode that…

PHYSICS · Single correct · A Level · Physics · Particles and radiation · Particles and radiation

Problem

Monochromatic light of frequency

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

and power

3\,\text{mW}

falls normally on a photo-cathode that emits one electron for every incident photon. Calculate the expected saturation current. (Take

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

,

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

.) (a)

12\,\text{mA}

(b)

0.12\,\text{mA}

(c)

1.2\,\text{mA}

(d)

1.2\,\mu\text{A}

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