Consider a thin target (10–2m square, 10–3m thickness) of sodium,

Question:

Consider a thin target (10–2m square, 10–3m thickness) of sodium, which produces a photocurrent of 100µA when a light of intensity 100W/m2 (λ = 660nm) falls

on it. Find the probability that a photoelectron is produced when a photon strikes a sodium atom. [Take density of Na = 0.97 kg/m3].

Solution:

Area = 10-4 m2

Thickness = 10-3 m

Current = 10-4 A

Intensity = 100 W/m2

Mass = (volume)(density) = 0.97 × 10-4 gm

No.of target atoms = 0.254 × 1019

Total energy = nhv

Where n = 3.3 × 1016

The probability of emission of photoelectrons is 7.5 × 10-21

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