series of colors of the rainbow. list of radioactive elements. band of frequencies of light waves. range of conductivity of metals.
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: The electromagnetic spectrum is described as a
Possibilities:
- series of colors of the rainbow.
- list of radioactive elements.
- band of frequencies of light waves.
- range of conductivity of metals.

band of frequencies of light waves.