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एक प्रकाश सुग्राहक धातु का कार्य - फलन 1.875 eV है। आपतित प्रकाश की उस तरंगदैर्ध्य की गणना कीजिए। जो प्रकाश इलेक्ट्रॉनों का ठीक उसर्जन कर सके।

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दिया है Φ = 1.875 eV

λ0 = ?

Φ0\(\frac{hc}{\lambda_0}\)

λ0\(\frac{hc}{\phi_0} = \frac{1242\ nm - eV}{1.875eV}\)

λ0 = 662 nm

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