<P> H - alpha ( Hα ) is a specific deep - red visible spectral line in the Balmer series with a wavelength of 656.28 nm in air ; it occurs when a hydrogen electron falls from its third to second lowest energy level . H - alpha light is important to astronomers as it is emitted by many emission nebulae and can be used to observe features in the Sun 's atmosphere , including solar prominences and the chromosphere . </P>
<P> H - alpha ( Hα ) is a specific deep - red visible spectral line in the Balmer series with a wavelength of 656.28 nm in air ; it occurs when a hydrogen electron falls from its third to second lowest energy level . H - alpha light is important to astronomers as it is emitted by many emission nebulae and can be used to observe features in the Sun 's atmosphere , including solar prominences and the chromosphere . </P>
when is h alpha line in the emission spectrum of hydrogen atom obtained
when is h alpha line in the emission spectrum of hydrogen atom obtained
when a hydrogen electron falls from its third to second lowest energy level
when a hydrogen electron falls from its third to second lowest energy level