Physics · Dual Nature of Matter and Radiation
किसी धातु का कार्य फलन (work function) 2.21 eV है। निम्नलिखित में से कौन-सा दृश्य प्रकाश (visible light) इससे फोटोइलेक्ट्रॉन उत्पन्न नहीं कर सकता है?
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