Question

Can you answer this?
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
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Answer 1

Answer:

Because sodium vapor lamps cause less light pollution than mercury-vapor lamps, many cities that have large astronomical observatories employ them.

Answer 2

Answer:

Neon

Explanation:

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