Question : The mercury and sodium street lamps light up because of:
Option 1: Atomic emission
Option 2: Atomic absorption
Option 3: Electron emission
Option 4: Electron absorption
Correct Answer: Atomic emission
Solution : The correct option is atomic emission.
Light is produced by atomic emission in mercury and sodium street lights. When an electric current flows through the lamp's vaporised mercury or sodium, electrons in the atoms become excited and subsequently return to their ground state, releasing energy in the form of visible light. This technique produces the distinctive light of these lamps.
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