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सीजियम का कार्यफलन 2eV है। इस कथन की व्याख्या कीजिए।

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सीजियम का कार्यफलन 2eV है। इस कथन की व्याख्या कीजिए। 

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सीजियम धातु के पृष्ठ से प्रकाश इलेक्ट्रॉन उत्सर्जित करने के लिए इस पर आपतित प्रकाश फोटॉन की न्यूनतम ऊर्जा 2 eV होनी चाहिए।

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