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एक धातु पृष्ठ पर 5 eV ऊर्जा का फोटॉन आपतित होता है । उत्सर्जित प्रकाश - इलेक्ट्रॉन हेतु निरोधी विभव 3.5 वोल्ट है । धातु के कार्य फलन की गणना जूल में कीजिए ।

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`hv=W+1/2 mv^(2)`
`W=hv-eV_(0)=5eV-3.5 eV=1.5 eV`
`=1.5 eV xx 1.6xx10^(-19)J//eV=2.4xx10^(-19)J`

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