Spectra
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The document discusses spectroscopy and spectral lines. It explains that spectra can be observed using a spectroscope, which contains a discharge tube, diffraction grating, and eyepiece. Gases like neon and helium emit distinct spectral lines that can be observed through the spectroscope and related to the energies of electron transitions in the gases. The wavelengths of the prominent red and blue lines in neon and helium spectra are measured and converted to frequencies and energies using physics equations.
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Spectra
- 1. Spectra
- 2. R O Y G B I V
- 3. Spectra
- 8. Spectra emission absorption may be may be continuous line
- 9. Discharge tubePD source Diffraction grating Eyepiece Spectroscope
- 10. Neon gas in tube, with PD across
- 11. Neon gas’s spectral lines, viewed through eyepiece
- 12. Helium gas’s spectral lines
- 16. Line Red 𝜆 656 nm = 656 x 10-9 m
- 17. Line Red Blue 𝜆 656 nm = 656 x 10-9 m 434 nm = 434 x 10-9 m
- 18. Line Red Blue 𝜆 656 nm = 656 x 10-9 m 434 nm = 434 x 10-9 m f = 𝑐 𝜆 = 3×108 656×10−9 = 4,57 x 1014 Hz
- 19. Line Red Blue 𝜆 656 nm = 656 x 10-9 m 434 nm = 434 x 10-9 m f = 𝑐 𝜆 = 3×108 656×10−9 = 4,57 x 1014 Hz = 𝑐 𝜆 = 3×108 434×10−9 = 6,91 x 1014 Hz
- 20. Line Red Blue 𝜆 656 nm = 656 x 10-9 m 434 nm = 434 x 10-9 m f = 𝑐 𝜆 = 3×108 656×10−9 = 4,57 x 1014 Hz = 𝑐 𝜆 = 3×108 434×10−9 = 6,91 x 1014 Hz
- 21. Line Red Blue 𝜆 656 nm = 656 x 10-9 m 434 nm = 434 x 10-9 m f = 𝑐 𝜆 = 3×108 656×10−9 = 4,57 x 1014 Hz = 𝑐 𝜆 = 3×108 434×10−9 = 6,91 x 1014 Hz E = hf = h f = 6,63 × 10-34 • 4,57 x 1014 = h f = 6,63 × 10-34 • 6,91 x 1014
- 22. Line Red Blue 𝜆 656 nm = 656 x 10-9 m 434 nm = 434 x 10-9 m f = 𝑐 𝜆 = 3×108 656×10−9 = 4,57 x 1014 Hz = 𝑐 𝜆 = 3×108 434×10−9 = 6,91 x 1014 Hz E = hf = h f = 6,63 × 10-34 • 4,57 x 1014 = 3,03 x 10-19 J = h f = 6,63 × 10-34 • 6,91 x 1014 = 4,68 x 10-19 J
- 25. light Coldgas
- 26. light Coldgas