Bohr’s third postulate: emission and absorption of a photonबोर का तृतीय अभिगृहीत: फ़ोटॉन का उत्सर्जन और अवशोषणBohr’s third postulate: emission and absorption of a photon
NCERT §12.4, §12.5 · Class 12 Physics · Chapter 12 · interactive diagram
Read Chapter 12 with this diagramइस डायग्राम के साथ अध्याय 12 पढ़ेंIs diagram ke saath Ch 12 padhiyeAll Physics diagramsसभी भौतिकी डायग्रामSaare Physics diagrams
Parts and what they mean
- Higher energy level E₂ (उच्च ऊर्जा स्तर E₂) — A stationary state with more energy (larger n).
- Lower energy level E₁ (निम्न ऊर्जा स्तर E₁) — A stationary state with less energy (smaller n).
- Electron drops E₂ → E₁ (इलेक्ट्रॉन E₂ → E₁ गिरता है) — The atom loses energy E₂ − E₁ …
- Emitted photon (उत्सर्जित फ़ोटॉन) — … carried away by one photon: hν = E₂ − E₁. This gives a bright emission line.
- Absorbed photon (अवशोषित फ़ोटॉन) — Only a photon with exactly hν = E₂ − E₁ is absorbed. Missing photons appear as a dark absorption line.
- Electron rises E₁ → E₂ (इलेक्ट्रॉन E₁ → E₂ उठता है) — The atom goes to a higher stationary state (larger n): E₁ + hν = E₂.
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