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जब सोडियम कैथोड पर 3000 Å का प्रकाश डाला जाता है , तो निरोधी विभव 1.85वोल्ट है और जब 4000Å का प्रकाश डाला जाता है तो निरोधी विभव 0.82वोल्ट हो जाता है । ज्ञात कीजिए: प्लांक नियतांक , सोडियम का कार्य फलन , सोडियम के लिये देहली तरंगदैर्घ्य ।

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`6.6xx10^(-34)` जूल-सेकण्ड , 2.275 eV, 5440 Å .

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