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एक दी हुई धातु के लिये देहली आवृत्ति `3.3 xx 10^(14)` हर्ट्स है यदि `8.2xx10^(14)` हर्ट्स आवृत्ति के प्रकाश को धातु पर डाला जाये , तो प्रकाशवैधुत उत्सर्जन के लिये संस्तब्ध वोल्टता (cut-off voltage) की गणना कीजिए । दिया है : ( `h=6.6xx10^(-34)` जूल - सेकण्ड )

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माना संस्तब्ध वोल्टता `V_(0)` है, तो
ऊर्जा `eV_(0)=h(v-v_(0))`
`=6.6xx10^(-34)(8.2xx10^(-14)-3.3xx10^(14))`
`=32.34xx10^(-20)`
`:. V_(0)=(32.34xx10^(-20)" जूल")/(1.6xx10^(-19)" कूलॉम ")`
`=20.2xx10^(-1)` जूल/कूलॉम = 2.02 वोल्ट ।

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