The colour of light emitted depends upon the nature of substance. Line spectra are also called atomic spectra because the lines represent wavelengths radiated from atoms when electrons change from one energy level to another. 2) Line Spectra When some volatile salt is placed in the bunsen flame or an electric discharge is passed through a gas at low pressure, light is emitted. Alternatively, line spectra can drawn as a negative white rectangle with black bands. Line spectra are characteristic of the elements that emit the radiation. Spectra Geospatial offers powerful, highly versatile yet ultra-rugged and reliable Global Navigation Satellite System (GNSS) positioning solutions for a wide variety of applications. ![]() Line spectrum of hydrogen Line spectrum of helium Line spectrum of sodiumīy analysing the line spectrum (or combination of line spectra) from sources of light, eg a star, it is possible to determine the chemical elements that make it up. This continuous spectrum is what would be seen from a source of white light.Įvery element in the periodic table produces a unique line spectrum when heated, consisting of specific colours at specific wavelengths seen as thin bands. Violet is refracted most, red light least.Ī spectroscope uses a prism to display the colours which make up a source of light. Each colour of light is refracted by different amounts, depending on its frequency - higher frequency colours are refracted more than lower frequency colours. These colours can be separated by splitting white light with a glass prism to obtain a spectrum. White light is made up of a range of colours. ![]() The prominent mercury lines are at 435.835 nm (blue), 546.074 nm (green), and a pair at 576.959 nm and 579.065 nm (yellow-orange). At the right of the image are the spectral lines through a 600 line/mm diffraction grating. Light refracted through a prism, showing rainbow of colours At left is a mercury spectral tube excited by means of a 5000 volt transformer. A spectral line is defined as a dark or bright line in an otherwise continuous and uniform spectrum, resulting from lights absorption or emission in a.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |