Electromagnetic Spectrum PDF

ELECTROMAGNETIC SPECTRUM Electromagnetic waves - waves that are made of electric and magnetic field components; does not need a medium to propagate — can travel through space TYPES OF ELECTROMAGNETIC WAVE (longest to shortest wavelength): I. Radiowave II. Microwave III. Infrared IV. Visibl...

ELECTROMAGNETIC SPECTRUM Electromagnetic waves - waves that are made of electric and magnetic field components; does not need a medium to propagate — can travel through space TYPES OF ELECTROMAGNETIC WAVE (longest to shortest wavelength): I. Radiowave II. Microwave III. Infrared IV. Visible light V. Ultraviolet VI. X-ray VII. Gamma ray TYPES OF ELECTROMAGNETIC WAVES: 1. Radio - used to broadcast and radio television 2. Microwave - used in cooking, radar, telephone, and other signals 3. Infrared - transmits heat from sun, fires, radiators 4. visible light - makes things able to be seen 5. ultraviolet - absorbed by the skin, used in fluorescent tubes 6. X-rays - used to view inside of bodies and objects 7. Gamma ray - used in medicine for killing cancer cells TYPES OF ELECTROMAGNETIC WAVES I: A. Radio waves - longest wavelength and shortest frequency B. Microwave - have one m to one mm of wavelength C. Infrared - short wavelength than microwave but longer that visible light D. Visible light - wavelengths range to 700 nm to 400 nm Red light - longest wavelength and lowest frequency Violet light - shortest wavelength and highest frequency E. Ultraviolet - wavelength is up to 400 nm to 10 nm F. X-rays & gamma rays - can pass through several opaque materials (ex: human body tissues) x-rays have the wavelength from 10 nm to 100 pm, while gamma rays have are those with 100 pm DISCOVERY OF ELECTROMAGNETIC WAVES: 1. Euclid of Alexandria - postulated that light “coming straight from the eye” travels in a straight line 2. Claudis Ptolemy - famous for his geometric model of the universe; studied the refraction of light and color phenomena