1. The Electromagnetic Spectrum1 Wavelength/frequency/energy

2. The Electromagnetic Spectrum2

3. 3 What is it? The electromagnetic spectrum is the complete spectrum or continuum of light including radio waves, infrared, visible light, ultraviolet light, X- rays and gamma rays An electromagnetic wave consists of electric and magnetic fields which vibrates thus making waves.

4. The Electromagnetic Spectrum4 Waves Properties of waves include speed, frequency and wavelength Speed (s), frequency (f) and wavelength ( ) are related in the formula x f = s All light travels at a speed of 3 s 10 8 m/s in a vacuum

5. The Electromagnetic Spectrum5 Wavelength, Frequency and Energy Since all light travels at the same speed, wavelength and frequency have an indirect relationship. Light with a short wavelength will have a high frequency and light with a long wavelength will have a low frequency. Light with short wavelengths has high energy and long wavelength has low energy

6. The Electromagnetic Spectrum6

7. 7 Radio waves Low energy waves with long wavelengths Includes FM, AM, radar and TV waves Wavelengths of 10 -1 m and longer Low frequency Used in many devices such as remote control items, cell phones, wireless devices, etc.

8. The Electromagnetic Spectrum8 Microwaves Longer than radio, shorter than light and infrared Wavelength 1 x 10 - 4 m to 1 x 10 -1 m First used in radar, now used in communication, medicine and consumer use (microwave ovens)

9. The Electromagnetic Spectrum9 Infrared waves Invisible electromagnetic waves that are detected as heat Can be detected with special devices such as night goggles Used in heat lamps Higher energy than microwaves but lower than visible light

10. The Electromagnetic Spectrum10 Visible Light The portion of the electromagnetic spectrum that human eyes can detect ROY G BIV (red, orange, yellow, green, blue, indigo, violet) Red is the lowest frequency and violet is the highest frequency

11. The Electromagnetic Spectrum11

12. The Electromagnetic Spectrum12 Ultraviolet waves Higher energy than light waves Can cause skin cancer and blindness in humans Used in tanning beds and sterilizing equipment

13. The Electromagnetic Spectrum13 X-Rays High energy waves First discovered by Roentgen Used in medicine, industry and astronomy Can cause cancer

14. The Electromagnetic Spectrum14 Gamma rays Highest energy

15. The Electromagnetic Spectrum15 Now, let’s really think 4. Can you actually see x-rays? –Support your answer. 5. Which color is more energetic, red or yellow? 6. Which type of wave travels faster, gamma or radio? 7. Why are microwaves more dangerous than radio waves?

16. MAP TAP 2003-2004The Electromagnetic Spectrum16 Answers 4. X-rays can not be seen, only the waves in the visible light portion are visible. 5. Yellow is higher energy than red because it has a shorter wavelength and higher frequency. 6. Both travel at the same speed, 300,000 km/s (all em waves travel at the same speed) 7. Microwaves have a higher frequency than radio and carry more energy.