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in Physics by (25.0k points)
एक फोटॉन , जिसकी ऊर्जा 3.4 eV है, एक ऐसी धातु की सतह पर आपतित होता है , जिसका कार्य फलन 2 eV है । धातु की सतह से उत्सर्जित फोटो इलेक्ट्रॉन की अधिकतम गतिज ऊर्जा होगी :
A. 1.4 eV
B. 1.7 eV
C. 5.4 eV
D. 6.8 eV .

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