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निम्नतम अवस्था में विद्यमान एक हाइड्रोजन परमाणु एक फोटॉन को अवशोषित करता है। जो इसे n = 4 स्तर तक उत्तेजित कर देता है। फोटॉन की तरंगदैर्घ्य तथा आवृत्ति ज्ञात कीजिए।

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ΔE = E4 - E1 = [- 0.85 - (- 13.6)] eV = 12.75 eV

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