Multiple choice

The most commonly used substances in fluorescent tubes are

  1. Sodium oxide and argon

  2. Sodium vapours and neon

  3. Mercury vapour and argon

  4. Mercuric oxide and neon
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Fluorescent tubes contain a small amount of mercury vapor and an inert gas like argon to facilitate the electrical discharge that produces ultraviolet light, which then excites the phosphor coating.

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