The range of frequencies and wavelengths is remarkable. Figure 11.2: The electromagnetic spectrum as a function of frequency. Though, all the waves can travel in a vacuum at the light speed in a broad range of frequencies, wavelengths & photon energies. The electromagnetic spectrum is a continuous range of wavelengths. The visible spectrum is the portion of the electromagnetic spectrum that is visible to the human eye. This EM radiation provides the information to our eyes that allows us to see. EM radiation in the visible part of the spectrum is scattered off all of the objects around us. Electromagnetic radiation in this range of wavelengths is called visible light or simply light.A typical human eye will respond to wavelengths from about 380 to 740 nanometers. Infrared radiation extends from the nominal red edge of the visible spectrum at 700 nanometers (nm) to 1 millimeter (mm). Electromagnetic spectrum, the entire distribution of electromagnetic radiation according to frequency or wavelength.Although all electromagnetic waves travel at the speed of light in a vacuum, they do so at a wide range of frequencies, wavelengths, and photon energies. The electromagnetic (EM) spectrum encompasses all wave frequencies, including radio, visible light and X-rays. Light or visible light is electromagnetic radiation within the portion of the electromagnetic spectrum that can be perceived by the human eye.
Each way of thinking about the EM spectrum is related to the others in a precise mathematical way. In terms of frequency, this corresponds to a band in the vicinity of 405–790 THz. The electromagnetic spectrum can be expressed in terms of energy, wavelength or frequency. The dividing line between some categories is distinct, whereas other categories overlap. Electromagnetic waves span a spectrum that ranges from long wavelength, low frequency radio waves to short wavelength, high frequency gamma rays. Electromagnetic Spectrum: The electromagnetic spectrum, showing the major categories of electromagnetic waves. Each way of thinking about the EM spectrum is related to the others in a precise mathematical way.
All EM waves are made up of photons that travel through space until they interact with matter; some waves are absorbed and others are reflected. Scientists represent wavelength and frequency by the Greek letters lambda (λ) and nu (ν). Scientists represent wavelength and frequency by the Greek letters lambda (λ) and nu (ν). The term Electromagnetic spectrum can be defined as, the distribution of entire electromagnetic radiation based on the wave’s wavelength and frequency. The electromagnetic spectrum can be expressed in terms of energy, wavelength or frequency. Visible light is usually defined as having wavelengths in the range of 400–700 nanometers (nm), or 4.00 × 10 −7 to 7.00 × 10 −7 m, between the infrared (with longer wavelengths) and the ultraviolet (with shorter wavelengths). This range of wavelengths corresponds to a frequency range of approximately 430 THz down to 300 GHz.Below infrared is the microwave portion of the electromagnetic spectrum. Definition and relationship to the electromagnetic spectrum. The different types according to wavelength are shown as well as everyday comparisons.
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