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किसी धातु का कार्य फलन 3.3 eV है । (i ) किस निम्नतम आवृत्ति का तथा (ii ) अधिक से अधिक किस दीर्घतम तरंगदैर्घ्य का फोटॉन इस धातु से फोटो - इलेक्टॉन उत्स

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किसी धातु का कार्य फलन 3.3 eV है । (i ) किस निम्नतम आवृत्ति का तथा (ii ) अधिक से अधिक किस दीर्घतम तरंगदैर्घ्य का फोटॉन इस धातु से फोटो - इलेक्टॉन उत्सर्जित कर सकेगा ?
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(i) `0.8xx10^(15) ` हर्ट्स , (ii) 3750 Å .
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