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in Physics by (93.6k points)
एक पदार्थ के कैथोड से 6000Å से अधिक तरंगदैर्घ्य कि विद्युतचुम्बकीय तरंगें, फोटो - इलेक्ट्रॉन उत्सर्जित नहीं करता हैं । इस कैथोड पर 4000Å का प्रकाश डालने पर उत्सर्जित फोटो इलेक्ट्रॉनों कि अधिकतम गतिज ऊर्जा ज्ञात कीजिए । (प्लांक नियतांक `h=6.6xx10^(-34)` जूल से है ।)

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