Of the following components,which are responsible for the main spectral emission lines found in an emission nebula?
A) Neutral helium,carbon,oxygen,and iron atoms
B) Ionized helium atoms and electrons
C) Protons,positrons,helium nuclei,and neutrinos
D) Hydrogen atoms,protons,and electrons

Question

Quizplus · Accepted Answer

The main spectral emission lines found in an emission nebula are due to the ionized hydrogen atoms (H II region) and the free electrons present in the cloud. Therefore, option D, which includes hydrogen atoms and electrons, is the best choice. Option A includes other elements like carbon, oxygen, and iron, which may contribute to the emission lines in certain cases, but are not the main contributors. Options B and C include ionized helium atoms and other particles, which may be present but are not responsible for the main spectral emissions in an emission nebula.

Of the Following Components,which Are Responsible for the Main Spectral