Nonexempt means one who is not exempt - for example, from paying taxes. This doesn't seem to make sense in this context, and I suggest you rephrase your question.
what does an electromagnetic spectrum consist of
The entire electromagnetic spectrum frequencies, from the lowest to the highest frequencies, are collectively called the electromagnetic spectrum.
No, it is not dangerous. It is just the colors that are absorbed by the light. Some parts of the electromagnetic spectrum are dangerous, however. To learn more in depth and to get more of an explanation on the visible spectrum and the electromagnetic spectrum, visit wikipedia.
The visible spectrum is a tiny, almost negligible slice of the electromagnetic spectrum. 'Sonar' has no place in this discussion. It's not even electromagnetic.
The electromagnetic spectrum includes electromagnetic waves with a continuous flow of the wavelength.
No reason. Light is an electromagnetic wave so you can call any part of the spectrum either.
It is not at all clear what you mean by locating the electromagnetic spectrum. Electromagnetism exists at innumerable locations throughout the universe. Vision is a sense that uses a part of the electromagnetic spectrum, and lots of animals can see. Some animals, such as bees, can see in ultraviolet frequencies that the human eye does not see.
Radio waves have the longest wavelength in the electromagnetic spectrum.
Radio waves have the lowest energy in the electromagnetic spectrum.
Visible light is a small section in the electromagnetic spectrum.
I think in the ultraviolet region of the electromagnetic spectrum.
It lies in infrared region of electromagnetic spectrum.