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

Sodium vapor lamps produce characteristic yellow-orange light (monochromatic at 589 nm) and are widely used for street lighting due to their high efficiency and long lifespan. Neon glows red-orange, while hydrogen and nitrogen are not used in street lamps.