Electromagnetic (EM) radiation is a form of energy that is all around us and takes many forms, such as radio waves, microwaves, X-rays and gamma rays. Designed by the teachers at SAVE MY EXAMS for the CIE A Level Physics 2019-21 (9702) syllabus. Electromagnetic spectrum is among our largest natural resources. Wavelengths of electromagnetic radiation, whatever medium they are traveling through, are usually quoted in terms of the vacuum wavelength, although this is not always explicitly stated. While long wavelength radiation (radiofrequencies, microwaves) is well described by wave theory, short wavelength radiation (X-rays) exhibits mostly particle properties. If the frequency is de-creased by half (50%), energy is decreased by half. X-rays are also emitted by stellar corona and are strongly emitted by some types of nebulae. He called these radiations x-rays and found that they were able to travel through parts of the human body but were reflected or stopped by denser matter such as bones. Energetic ejection of core electrons in heavy elements, This page was last edited on 24 December 2020, at 12:49. These types of interaction are so different that historically different names have been applied to different parts of the spectrum, as though these were different types of radiation. Many people think that the only form of light that exist is the light that we can see but this is not true. The electromagnetic spectrum is a continuous range of wavelengths. In 1900 Paul Villard was studying the radioactive emissions of radium when he identified a new type of radiation that he first thought consisted of particles similar to known alpha and beta particles, but with the power of being far more penetrating than either. We can see waves in water and hear waves as sound, but we haven't yet discussed the waves that we perceive as light. Visible light, as can be seen on the electromagnetic spectrum, represents a narrow band between ultraviolet light (UV) and infrared energy (heat). Electrodynamics is the physics of electromagnetic radiation, and electromagnetism is the physical phenomenon associated with the theory of electrodynamics. The parameters that characterize a wave motion are wavelength (λ), frequency (ν) and velocity (c). Microwave energy is produced with klystron and magnetron tubes, and with solid state devices such as Gunn and IMPATT diodes. FREE Physics revision notes on Principles of Electromagnetic Induction. The electromagnetic spectrum ranges from the shorter wavelengths (including gamma and x-rays) to the longer wavelengths (including microwaves and broadcast radio waves). Optical fiber transmits light that, although not necessarily in the visible part of the spectrum (it is usually infrared), can carry information. Metasurfaces are artificially structured thin films with unusual properties on demand. Principles of Electromagnetic Spectrum and Satellite Platforms. For example, red light resembles infrared radiation in that it can excite and add energy to some chemical bonds and indeed must do so to power the chemical mechanisms responsible for photosynthesis and the working of the visual system. 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