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

question 28

Multiple Choice

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