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In theory, hydrogen has infinitely many spectral lines. The "Balmer series" has four lines in the visible spectrum; additional lines are in the ultraviolet. Other "series" have other lines - it seems that all of them are either in the ultraviolet or infrared. For more information, read the Wikipedia article on "Hydrogen spectrum". The reason there are four VISIBLE lines is basically chance - an excited hydrogen atom emits light at certain frequencies (which can be calculated, see the article for more details); our eyes see a certain range of electromagnetic waves that happens to include four of those lines.

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Q: Why does hydrogen spectrum contains 4 coloured lines why not 3 or 7?
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Related questions

Does the helium spectrum have twice as many lines as the hydrogen spectrum?

No. In vacuum(i.e.no continuum lowering), both have an infinite number of lines in the spectrum, hence the question makes no sense.


What does it mean when a star has no hydrogen lines in its spectrum?

it means it just diesnt


Why the distances between the lines for the hydrogen spectrum decreases with the decrease in wavelength?

Just one line for hydrogen.


Who developed an equation used to predict the lines in the emission spectrum of hydrogen?

Rydberg


Why hydrogen gas have large no of lines?

The fraunhofer (absorption) and excitation spectrum of hydrogen has lines for each energy level that electrons can pass from one excitation stat to another.


Who developed an empirical equation from which the wave lenghts of lines in the spectrum of hydrogen atoms can be calculated?

Rydberg


Can The optical spectrum of hydrogen and all other elements consist of a set of discrete lines?

true


Which element did Bohr study the line emission spectrum of?

Niels Bohr studied the emission lines of Hydrogen.


What are the absorption lines in the infrared portion of the spectrum of a star that are produced by hyrdrogen are from?

The absorption lines in the infrared portion of the spectrum of a star that are produced by hydrogen are from the Balmer series. The Balmer series were discovered by Johann Balmer in 1885.


How do you think the lines you observed in the hydrogen emission spectrum relate to the energy of the electrons in a hudrogen atom?

For a detailed explanation on the relation between spectrum lines electron energy check out avogadro.co.uk/light/bohr/spectra.htm


What has the author Percy Lowe written?

Percy Lowe has written: 'Structure of the Balmer series lines in the spectrum of hydrogen'


What evidence do you have the sun contains the element iron?

The spectral lines. Each element has a characteristic "fingerprint" in a spectrum.