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: Option A
Solution(By Examveda Team)
A sodium-vapour 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. Because sodium vapour lamps cause less light pollution than mercury-vapour lamps, many cities that have large astronomical observatories employ them.Related Questions on Chemistry
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B. Fire in coal mines
C. Dry farming
D. Monsoon
E. Trade winds
The nucleus of an atom consists of
A. electrons and neutrons
B. electrons and protons
C. protons and neutrons
D. All of the above
The number of moles of solute present in 1 kg of a solvent is called its
A. molality
B. molarity
C. normality
D. formality
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