We also provide extensive NCERT solutions, sample papers, NEET, JEE Mains, BITSAT previous year papers, which makes us a one-stop solution for all resources. Physics Wallah is India's top online ed-tech platform that provides affordable and comprehensive learning experience to students of classes 6 to 12 and those preparing for JEE and NEET exams. Each element gives its own characteristic spectrum. Each line in the spectrum corresponds to a particular wavelength. If this light is resolved by a spectroscope, It is found that some isolated coloured lines are obtained on a photographic plate separated from each other by dark spaces. Ii) Line spectra: When an electric discharge is passed through a gas at low pressure light is emitted. Hence the spectrum is called as continuous spectrum. These colour are so continuous that each of them merges into the next. I) Continuous spectra: When white light from any source such as sun or bulb is analysed by passing through a prism, it splits up into seven different wide bands of colour from violet to red (like rainbow). The pattern of lines in atomic spectrum is characteristic of hydrogen. N1 and n2 have integral values as follows The wavelength of all these series can be expressed by a single formula. The entire spectrum consists of six series of lines each series, known after their discoverer as the Balmer, Paschen, Lyman, Brackett, Pfund and Humphrey series. The lines in the visible region can be directly seen on the photographic film.Įach line of the spectrum corresponds to a light of definite wavelength. This series of lines is known as line or atomic spectrum of hydrogen. If an electric discharge is passed through hydrogen gas taken in a discharge tube under low pressure, and the emitted radiation is analysed with the help of spectrograph, it is found to consist of a series of sharp lines in the UV, visible and IR regions. This line constitutes the emission spectrum. If the atom loses energy, the electron passes from higher to a lower energy level, energy is released and a spectral line of specific wavelength is emitted. This dark line constitutes the absorption spectrum. Consequently, a dark line will appear in the spectrum. If the atom gains energy the electron passes from a lower energy level to a higher energy level, energy is absorbed that means a specific wave length is absorbed.
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