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Directions for EM Spectrum book You will need 4 sheets of clean, untorn notebook paper. Take one sheet and fold it hamburger style leaving, two lines exposed on the bottom. Take another sheet and fold it the same way, only this time leave four lines exposed on the bottom. Next sheet 6 lines exposed. Next sheet, 8 lines exposed. Now assemble them into a flip book and staple at the top. Label each flap to correspond with the EM Spectrum Color code the flaps to correspond to ROY G BIV

Electromagnetic spectrum Mini-book Assessment One type of EM wave for each page Each page should contain the: wavelength, wave frequency, relative size, uses, facts, hazards, picture that relates to type The front of your flip book should be colored to correspond with roygbiv…because visible light is composed of these colors of light.

EM Waves Electromagnetic waves are actually made up of 2 parts: an electric force field and a magnetic force field. That’s where the name electo…magnetic comes from! An electromagnetic wave is produced by vibrating electrical and magnetic charges. In fact, all waves are produced by something vibrating.

Waves in space? Most waves, like sound waves or oceans waves must have a medium (some form of matter) through which they travel. However, electromagnetic waves can travel with or without a medium. This allows EM waves to travel through the empty vacuum of space. Sunlight and ultraviolet radiation that both light and heat our planet, travel millions of miles from the Sun to Earth by EM waves.

EM Waves are transverse waves All electromagnetic waves are transverse waves. Transverse waves move up and down or side to side at repeated right angles in the direction of the wave’s energy.

Parts of a transverse wave ? Frequency Prompt students to guess what the teal box, then the blue box, is hiding. (Wavelength, Amplitude) ?

Electromagnetic spectrum Long Wavelength Short Wavelength High Frequency Low Frequency

Electromagnetic waves All EM waves travel at the speed of light which is 300 million m/s. The Sun is 150 gigameters or 95 million miles away from the Earth. Traveling at the speed of light, it take sunlight 8 minutes and 20 seconds to reach Earth….WOW! Scientist like Einstein struggle with the dual nature of light. On the one hand It’s an atomic particle called a photon. On the other it’s a EM wave.

The Electromagnetic Spectrum https://www.youtube.com/watch?v=m7c4-EO7ECE

Clicking the little rainbow box at the top of each slide will bring you back to this one

Radio waves Longest wavelength EM waves Uses: TV broadcasting AM and FM broadcast radio Avalanche beacons Heart rate monitors Cell phone communication Click the little rainbow box in the top right corner to return to the overview EM spectrum diagram

Microwaves Wavelengths from 1 mm- 1 m Uses: Microwave ovens Bluetooth headsets Broadband Wireless Internet Radar GPS Click the little rainbow box in the top right corner to return to the overview EM spectrum diagram

Micro Waves: Mobile Phones 0.2C temperature rise Pictures from Gerard van Leeuwen

Micro Waves: Mobile Phones Mobile phones use microwave energy. We know that microwaves can cook food – can a mobile phone cause heating? Pictures from Gerard van Leeuwen Needs explanation

Infrared Radiation Wavelengths in between microwaves and visible light Uses: Night vision goggles Remote controls Heat-seeking missiles Click the little rainbow box in the top right corner to return to the overview EM spectrum diagram

Uses of Infrared waves Remote controls for TVs and intruder alarms

Infrared Thermography

Visible light Only type of EM wave able to be detected by the human eye (ROY G. BIV) Violet is the highest frequency light Red light is the lowest frequency light Click the little rainbow box in the top right corner to return to the overview EM spectrum diagram

Visible light λ ≈ 700 nm λ ≈ 420 nm

Ultraviolet Shorter wavelengths than visible light Uses: Black lights Sterilizing medical equipment Water disinfection Security images on money There is one more UV slide…

Ultraviolet waves λ ≈ 700 - 420 nm

Ultraviolet (cont.) UVA UVB and UVC Energy Highest of UV waves Lower than UVA Health risks Can cause DNA damage, leading to skin cancer Responsible for sunburn No serious risk for DNA damage. Can cause Vitamin A deficiency. Table will fill in from left to right, top to bottom as you advance through. Click the little rainbow box in the top right corner to return to the overview EM spectrum diagram

X-rays Tiny wavelength, high energy waves Uses: Medical imaging Airport security Inspecting industrial welds Click the little rainbow box in the top right corner to return to the overview EM spectrum diagram

Gamma Rays Smallest wavelengths, highest energy EM waves Uses Food irradiation Cancer treatment Treating wood flooring Click the little rainbow box in the top right corner to return to the overview EM spectrum diagram