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किसी धातु की देहली आवृत्ति `3.3xx10^(14)Hz` है। यदि `8.2xx10^(14)Hz` आवृत्ति का प्रकाश धातु पर आपतित हो, तो प्रकाश - विद्युत उत्सर्जन के लिए अंतक वोल्टता ज्ञात कीजिए ।

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दिया है - `v_(0)=3.3xx10^(14)Hz`
`v=8.2xx10^(14)Hz`
सूत्र - `eV_(0)=hv-hv_(0)`
या `" "V_(0)=(h(v-v_(0)))/(e)`
`=(6.63xx10^(-34)xx(8.2xx10^(14)-3.3xx10^(14)))/(1.6xx10^(-19))`
`=2.03` वोल्ट

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