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| Q. |
Now-a-days yellow lamps are frequently used as street lights. Which of the following gases is used in these lamps? |
| A. | Sodium |
| B. | Neon |
| C. | Hydrogen |
| D. | Nitrogen |
| Answer» A. Sodium | |
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Explanation: A sodium-vapor lamp is a gas- discharge lamp that uses sodium in an excited state to produce light. There are two varieties of such lamps: low pressure and high. pressure. Low-pressure sodium lamps are the most efficient electrical light sources, but their yellow light restricts applications to outdoor lighting such as street lamps. High-pressure sodium lamps have a broader spectrum of light but poorer colour rendering than other types. |
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