calculate the wavelength of H alpha line in balmer series of atom
what is H alpha line?
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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.
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An object starts from rest at x=0 m and moves with a constant acceleration of 1.6 m/s^2 along the x-axis during its journey from x=12.8 m to 20.0 m its average velocity will be
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