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किसी धातु का कार्यफलन 4.4 eV है क्या इस पर दृश्य प्रकाश डालने से इलेक्ट्रॉन उत्सर्जित होगा ? गणना द्वारा पुष्टि कीजिये ।

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किसी धातु का कार्यफलन 4.4 eV है क्या इस पर दृश्य प्रकाश डालने से इलेक्ट्रॉन उत्सर्जित होगा ? गणना द्वारा पुष्टि कीजिये ।
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धातु के लिये देहली तरंगदैर्घ्य `lambda_(0) (= hc/W) = 2812.5 Å` है । अत : इलेक्टोन उत्सर्जित नहीं होंगे ।
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