Electromagnetic Waves Waves a review Wave Shape transverse

Electromagnetic Waves

Waves… a review Wave Shape: transverse or longitudinal. p Transverse: water waves and EM waves p Longitudinal: sound waves p Mechanical waves require a medium & EM waves do not. p

Introduction to EM Waves: p p Nuclear fusion in the Sun creates electromagnetic radiation The radiation travels through space in the form of waves. 7 types of EM waves Organized on the EM Spectrum by wavelength and frequency http: //www. youtube. com/watch? v=yf. S 4 iz. Xc. Ubc Tour of the EM Spectrum

Electromagnetic waves Can travel in a “vacuum” (outer space!) p Do NOT need a medium p Travel at the speed of light (300, 000 km/s) p

THE ELECTROMAGNETIC SPECTRUM longest wavelength lowest frequency shortest wavelength highest frequency

Radio waves p Longest wavelength p Lowest frequency (energy) p Uses: n n TV broadcasting AM and FM broadcast radio Heart rate monitors Cell phones

Microwaves p Uses: n Microwave ovens n Bluetooth headsets n Radar n GPS

Infrared Radiation p Uses: n Heat lamps n Night vision goggles n Remote controls n Heat-seeking missiles

Visible light p p p Only EM wave that is detected by the human eye Visible Light Spectrum: Red, orange, yellow, green, blue, indigo, violet Memory technique: ROY G BIV Red: lowest frequency, largest wavelength Violet: highest frequency, smallest wavelength

Ultraviolet (UV Rays) p Uses: n Tanning beds n Sterilizing medical equipment n Water purification n Security images on money n Provides Vitamin D

X-rays p Small wavelength p High frequency Uses: n n Medical images of bones Airport security

Gamma Rays p Shortest wavelength EM waves p Greatest frequency (energy) p Most dangerous p Uses: n n Cancer treatment Nuclear bombs

EM SPECTRUM ASSIGNMENT: Directions: Complete the Wavestown Assignment There are 23 examples of EM Waves, in the picture of the town.