Multiple choice

These days yellow lamps are frequently used as street-light. Which one of the following is used in these lamps?

  1. Sodium

  2. Neon

  3. Hydrogen

  4. Nitrogen
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Yellow street lamps use sodium vapor, where sodium is the primary element that produces the characteristic yellow light when electrically excited. Option A 'Sodium' is correct. These lamps are called sodium vapor lamps and are efficient for street lighting.

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