Chemistry: Animation, Video, and Laboratory Activity

If electricity is passed through a discharge tube containing hydrogen gas at very low pressure, the hydrogen molecules are split into individual atoms.these excited hydrogen emit a violet light which, when passed through a prism, produces a specrtum consisting of a series of bright lines separated by dark spaces.

The spectrum produces is called a line emission spectrum and indicates that excited atoms emit light of certain frequencies only. The occurrence of line emission spectra for hydrogen and other elements could not be satisfactorily explained in terms of classical physics at the beginning of the twentieth century. To account for these observations a radical revision of the laws and theories of physics was required.

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Source of animation from Learnestv.com