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in Physics by (25.0k points)
किसी धातु के लिए कार्य फलन 4 eV है । इस धातु के पृष्ठ से शून्य वेग का प्रकाश - इलेक्ट्रॉन उत्सर्जित करने के लिए आपतित प्रकाश की तरंगदैर्घ्य होनी चाहिए :
A. 2700 Å
B. 1700 Å
C. 5900 Å
D. 3100 Å

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