Question : Now-a days yellow lamps are frequently used as street lights. Which of the following gases is used in these lamps?
Option 1: Sodium
Option 2: Neon
Option 3: Hydrogen
Option 4: Nitrogen
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Correct Answer: Sodium
Solution : The correct option is Sodium.
Yellow street lights are frequently made of high-pressure sodium (HPS) or low-pressure sodium (LPS) bulbs. This lamp emits a characteristic yellow or orange-yellow light. When energised by an electric current, sodium vapour creates a primarily yellow-orange light, which is utilised in low-pressure sodium lamps (LPS). Because of its energy efficiency and extended lifespan, sodium vapour lamp technology is a popular choice for street lighting in many places.
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