context: Electromagnetic spectrum is a general term that includes all possible frequencies of electromagnetic radiation. [1] [2] [3] The electromagnetic spectrum is also known (usually called the spectrum only) as radiation lines emitted from a black body at a certain temperature (Each line has a specific wavelength and frequency). Each chemical element has a spectrum that distinguishes it, i.e. it has a series of lines that distinguish it from others, and this spectrum is called a "emission spectrum." The spectrum of radiation emitted from an object changes with body temperature, and the black color is chosen in particular because it is "ideal" in absorbing the radiation and is also ideal for emitting radiation. The spectrum of the elements is usually in the visible light range.
question: What is the electromagnetic spectrum?
answers.text: radiation lines emitted from a black body at a certain temperature