Physics Ray Optics Prism Theory & Dispersion of Light Single Correct MCQ
Published on: September 12, 2026

A neon sign does not produce

A
Line spectrum
B
An emission spectrum
C
An absorption spectrum
D
Photons

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Text Solution

Verified by Experts
The correct answer is:
C
Step 1: Understand the nature of neon signs. Neon signs produce light by exciting neon gas, which emits light when the electrons return to their ground state.
Step 2: Identify the types of spectra.
  • Line spectrum: Produced when an element emits light at specific wavelengths; neon signs emit a line spectrum due to the transitions of electrons in neon atoms.
  • Emission spectrum: This is produced when atoms release energy (photons) in the form of light after being energized, which is the case with neon signs.
  • Absorption spectrum: This occurs when light passes through a cold gas and certain wavelengths are absorbed by the atoms of the gas, resulting in missing lines in the spectrum.
  • Photons: Neon signs do produce photons when they emit light.
Step 3: Since neon signs emit light and therefore create a line and emission spectrum, the only spectrum they do not produce is the absorption spectrum.
Therefore, the correct answer is C.

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