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488 नैनोमीटर तरंगदैर्घ्य का प्रकाश एक आर्गन लेसर से उत्पन्न किया जाता है , जिसे प्रकाशवैधुत प्रभाव के उपयोग में लाया जाता है । जब इस स्पेक्ट्रमी -रेखा के प्रकाश को उत्सर्जक पर आपतित किया जाता है , तब प्रकाशित इलेक्ट्रॉनों का निरोधी (अंतक ) विभव 0.38 V है । उत्सर्जक के पदार्थ का कार्य - फलन ज्ञात करें।

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`E_(k)=(hc)/(lambda)-W` तथा `E_(k)=eV_(0)`
`:. W==(hc)/(lambda)-eV_(0)`
`=(6.63xx10^(-34)xx3.0xx10^(8))/(488xx10^(-9))-1.6xx10^(-19)xx0.38`
`=3.47xx10^(-19)` जूल
`=(3.47xx10^(-19))/(1.6xx10^(-19))=2.17 eV`.

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