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EMR by Mind Map: EMR
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EMR

Spectrum

Radio

Lowest Frequency

Highest Wavelength

Produced By Charged Particles Moving Back And Forth

Used mainly for communication, radar and radio astronomy

Microwave

Frequencies from 300MHz-300GHz

Wavelengths of 1mm-1m

Created by Vacum Tubes which use Clumps of electrons rather than steady stream.

Used for communication, radar, navigation, power/cooking

Infared

.7 and 300 micrometer wavelength

frequency of 1 and 430THz

Used for thermal applications in both the military and civilian world

Visible

Interaction with the atmosphere scatters more blue end of the spectrum so mid morning sky appears to be blue.

Frequency of 400-790 Thz

EM strikes objects and reflects therefore allowing color to be seen

Ultraviolet

Waves of 10-400Nm

Used for Cleaning, Pest Cotrol, authentication, forensics, and purification.

X-Ray

frequency of 30petahertz-30exahertz

Basically they are used to look inside objects

Gamma Ray

Have high frequency and very short wavelengths

Created by an atom decaying

Extremely harmful so used for sterilization, also used for some anti cancer treatments

Order of

Interactions

Reflection, Change in direction

Specular: mirror like

Diffuse: retains energy but looses image

Refraction: Change in direction due to change in speed. A good example being light going through a different medium

Dispersion: Phase velocity of wave depends on frequency. Example being a rainbow in which white light is picked apart into different colors and frequencys

Difraction: When a wave encounters an obstacle so the waves bend. An example being the particles in the atmosphere creating a ring around the sun and moon.

Interference is the addition of two or more wave patterns that in turn create a new wave.

Polarization: Describes the orientation of the waves, light exhibits polarization while sound does not(sine wave)

Absorbtion: EM of a photon is taken up by matter and transformed into a different energy. E.g. the transformation of light to heat when EM comes in contact with matter.

Scattering is when EM is forced to deviate from straight path. White surfaces scatter all light wavelengths.

Transparent: Allows light to pass through an object, Translucent: Allows light to be passed through depending on frequency and wavelength eg filters, and Opaque: Scatters radiation in a medium so its neither translucent or transparent

Fluorescence: Emission of light by matter which has obsorbed EMR. Exaple being using UV(Blacklight) on the glow in the dark items.

Phosphorescence is like fluorescence but does not immediately reemit the energy but does so over several hours at a lower intensity.

Color

Physical v. Physiological: Color comes in on certain frequencies but to see the brain relies on certain cells which can alter appearence

Additive: Red, Blue, and green which when combined create secondary colors. Directly admitted from light

Subtractive: Magenta, Cyan, Yellow when combined or used take away wavelengths giving it color. Filters and the like

Energy

Basic Unit is the Photon

Photon caries energy and momentum

Propogation

Can go through both Vacum and Matter

Frequency

Number of repetitions in period of time. For EM measured in Hertz

Wavelength

Period of the wave, basically the distance of the waves shape repeats.