Answer to Question #118053 in Optics for Priya Mehra

Question #118053
Why does sodium lamp give a red colour initially when switched on before giving yellow light?
1
Expert's answer
2020-05-25T11:05:35-0400

When the lamp is first started, it emits a dim red/pink light to warm the sodium metal; within a few minutes as the sodium metal vaporizes, the emission becomes the common bright yellow.


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