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आरंभ में निम्नतम अवस्था में कोई हाइड्रोजन परमाणु किसी फोटोंन को अवशोषित करता है, जो उसे n = 4 स्तर तक उत्तेजित कर देता है। फोटॉन की आवृत्ति का अनुमान लगाइए।

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प्रश्नानुसार n1 = 1, n2 = 4

∴ उत्सर्जित फोटॉन की तरंगदैर्ध्य λ हो तो

उत्सर्जित फोटॉन की तरंगदैर्ध्य

फोटॉन की आवृत्ति v = \(\frac{c}{\lambda}\)

v = \(\frac{R_c \times 15}{16}\)

v = \(\frac{15}{16} \) x 1.097 x 107 x 3 x 108

v = 3.08 x 1015 Hz

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