WBCS.LIVE practice question

Sodium vapour lamps glow with yellow colour. This is due to

Solve this multiple-choice question and check the correct answer with its explanation below.

Answer options

  1. Sublimation of sodium to emit yellow colour
  2. The emission of excess energy absorbed by sodium atoms, in the yellow region of the spectrum
  3. The low ionisation energy of sodium
  4. Its ability to absorb all other colours except yellow

Correct answer and explanation

Correct answer: The emission of excess energy absorbed by sodium atoms, in the yellow region of the spectrum