Line spectrum of hydrogen: emission and absorption (visible Balmer lines)हाइड्रोजन का रेखा स्पेक्ट्रम: उत्सर्जन और अवशोषण (दृश्य बामर रेखाएँ)Line spectrum of hydrogen: emission and absorption (visible Balmer lines)
NCERT Fig 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
- Emission line spectrum (उत्सर्जन रेखा स्पेक्ट्रम) — Hydrogen gas excited at low pressure (e.g. by an electric discharge) gives only certain wavelengths: bright lines on a dark background — a “fingerprint” of hydrogen.
- Absorption spectrum (अवशोषण स्पेक्ट्रम) — White light through cool hydrogen: dark lines appear at exactly the same wavelengths as the emission lines.
- Hα line, 656.3 nm (red) (Hα रेखा, 656.3 nm (लाल)) — Electron jumps n = 3 → n = 2. Photon energy 1.89 eV.
- Hβ line, 486.1 nm (blue-green) (Hβ रेखा, 486.1 nm (नीला-हरा)) — Electron jumps n = 4 → n = 2. Photon energy 2.55 eV.
- Hγ line, 434.1 nm (blue-violet) (Hγ रेखा, 434.1 nm (नीला-बैंगनी)) — Electron jumps n = 5 → n = 2. Photon energy 2.86 eV.
- Hδ line, 410.2 nm (violet) (Hδ रेखा, 410.2 nm (बैंगनी)) — Electron jumps n = 6 → n = 2. Photon energy 3.02 eV.
- Series limit 364.6 nm (श्रेणी सीमा 364.6 nm) — The lines crowd together towards 364.6 nm (n = ∞ → 2), in the ultraviolet.
Original diagram drawn by Simple Learning Hub, based on NCERT Fig 12.5. Report a mistake