Sodium vapour lamp glow with yellow colour due to
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Sodium-vapour lamp. ... When current passes between the electrodes, it ionizes the neon and argon, giving a red glow until the hot gas vaporizes the sodium. The vapourized sodium ionizes and shines a nearly monochrome yellow.
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Sodium vapour lamps glow with yellow colour. This is due
sublimation of sodium to emit yellow colour; the emission of excess energy absorbed by sodium atoms, in the yellow region of the spectrum; the low ionisation .
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