Electromagnetic Spectrum

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Electromagnetic waves that are classified in ascending(=increasing ) order of energy (frequency); they propagate at the speed of light (300,000 km/s).

frequency = the rate at which something occurs over a particular period of time. In physics it's the rate per second of a vibration constituting a wave, either in a material (as in sound waves), or in an electromagnetic field (as in radio waves and light).

emitted = produced and discharged

exposure = the state of having no protection from something harmful

EFL subset that concentrates more on language in context than on grammar and language structures. It covers topics from accounting or computer science to tourism and business management. "Specific" means the studying through a field that is already known and relevant to a student.