Week 1c Chapter5 Electromagnetic Force & History of Chiropractic Radiology

Week 1c Chapter5 Electromagnetic Force & History of Chiropractic Radiology

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Chapter 5 Electromagnetic Radiation A photon is the smallest element of electromagnetic energy. Photons are energy disturbances moving through space at the speed of light. Photons have no mass but they do have electric and magnetic fields.
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Electromagnetic Radiation A field is an interaction between different energies, forces or masses that can not be seen but can be described mathematically. Electromagnetic Radiation can be represented by the sine-wave model. Sine-waves have amplitude.Amplitude is one half the range from crest to valley over a sine wave.
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Electromagnetic Radiation The important properties of the sine-wave model are frequency(f) and wavelength(λ) and velocity. Frequency is the number of wavelengths passing a point per second. Frequency is identified as oscillations per second and measured in hertz (Hz).
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Electromagnetic Radiation Wavelength is the distance from one crest to another or from any point in the wave to the next corresponding point. The wave parameters are very important. A change in one affects the value of one or both of the others.
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Electromagnetic Radiation At a given velocity, wavelength and frequency are inversely proportional. The Wave Formula Velocity= Frequency x Wavelength
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Electromagnetic Radiation With EMF we know the velocity so the formula is simplified. c= fλ or f= c/λ or λ= c/f As frequency increases, wavelength decreases and vice versa For electromagnetic radiation, frequency and wavelength are inversely proportional.
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Electromagnetic Spectrum The electromagnetic spectrum includes the entire range of electromagnetic radiation. The frequency range is from about 10 2 to 10 24 Hz Photon wavelengths range from 10 7 to 10 -16 m. Grouped together, these radiations make up the electromagnetic spectrum.
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Electromagnetic Spectrum Three important ranges. Visible light Radio frequency X-radiation Others include: UV IR and microwave
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Electromagnetic Spectrum EMF can be measured in three formats Energy (eV) used to describe x-rays Frequency (Hz) Wavelength (m)
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Visible Light Measured in wavelength. A prism is used to refract or change the direction of the photons. Only form of EMF that we can sense.
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Forms of Light Visible light ranges from 700nm to 400nm wavelength. Infrared light have longer wavelength than visible light but shorter than microwaves. Ultraviolet light is located between visible light and ionizing radiation.
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Radiofrequency AM radio, FM radio and Television are other forms of electromagnetic radiation. With radio, the frequency is used to identify the station.
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This note was uploaded on 01/03/2012 for the course LC 232 taught by Professor Wilson during the Fall '08 term at Palmer Chiropractic.

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Week 1c Chapter5 Electromagnetic Force & History of Chiropractic Radiology

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