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Electromagnetic Radiation (Electromagnetic Spectrum images (Radio Waves…
Electromagnetic Radiation
General Properties
Able to travel through vacuum
Speed of light is always a constant
Wavelength is measured between either troughs or crests
Forms when an electric field couples with a magnetic field
can either act as wave or particle
Wave-particle duality
Wave
Has velocity, wavelength and frequency
Travel with a speed of light
Particle
Represented as a photon
Electrons absorb photon to move up and release photon to move down to another energy level
Different energy levels will emit and absorbs different frequencies
Higher energy photons have shorter wavelength and thus have greater penetration power
Electromagnetic Spectrum
Radio Waves
Wavelength :check: 10^3 m
Lowest energy levels
Applications
:check: Remote sensing
:check:Radar System
Microwaves
measured in cm
Applications
:check: Remote Sensing
:check: Broadcast information
good for transmitting information because the energy can go through substances
Infrared Radiation
Released in heat or thermal energy
Can be bounced back
Applications :check:Remote sensing
Visible Light
Can see with naked eye
Spectrum includes a range of different colors that all represent a particular wavelength
UV Radiation
High energy
Leads to cancer
X-Ray
Produce medical images of the body
Gamma Ray
Used in chemotherapy in order to get rid of tumors
High energy level
10^-12 m in wavelength
TAN JIN ZHENG 134333 ENG LYE YEE 134313 CHAN HUAN QUAN 135891
