21. Where can learn more about the spectral lines of substances? 22. His measurements concerning intensities of spectral lines brought Physical Laboratory in the international limelight. 23. These peaks and troughs are spectral lines and they indicate the presence of different elements. 24. The system shows variable brightness and spectral line profiles. 25. Mechanisms other than atom-photon interaction can produce spectral lines . 26. Spectral lines are the result of interaction between a orbitals ), the photon is absorbed.27. Hendrik Kramers had earlier calculated the relative intensities of spectral lines in the large orbits. 28. This gas both widens the spectral line and increases the transmission rate of the filter. 29. Spectral line will talk a bit about discrete spectrum.30. The witch of Agnesi approximates the spectral energy distribution of spectral lines , particularly X-ray lines.
