The Electromagnetic Spectrum

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1 The Electromagnetic Spectrum Wavelength/frequency/energy MAP TAP The Electromagnetic Spectrum 1

2 Teacher Page Content: Physical Science The Electromagnetic Spectrum Grade Level: High School Creator: Dorothy Walk Curriculum Objectives: SC 1; Intro Phys/Chem IV.A (waves) MAP TAP The Electromagnetic Spectrum 2

3 MAP TAP The Electromagnetic Spectrum 3

4 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. MAP TAP The Electromagnetic Spectrum 4

5 Waves Properties of waves include speed, frequency and wavelength Speed (s), frequency (f) and wavelength (l) are related in the formula l x f = s All light travels at a speed of 3 s 10 8 m/s in a vacuum MAP TAP The Electromagnetic Spectrum 5

6 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 MAP TAP The Electromagnetic Spectrum 6

7 MAP TAP The Electromagnetic Spectrum 7

8 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. MAP TAP The Electromagnetic Spectrum 8

9 MAP TAP The Electromagnetic Spectrum 9

10 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) MAP TAP The Electromagnetic Spectrum 10

11 MAP TAP The Electromagnetic Spectrum 11

12 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 MAP TAP The Electromagnetic Spectrum 12

13 MAP TAP The Electromagnetic Spectrum 13

14 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 MAP TAP The Electromagnetic Spectrum 14

15 MAP TAP The Electromagnetic Spectrum 15

16 Ultraviolet waves Higher energy than light waves Can cause skin cancer and blindness in humans Used in tanning beds and sterilizing equipment MAP TAP The Electromagnetic Spectrum 16

17 MAP TAP The Electromagnetic Spectrum 17

18 X-Rays High energy waves First discovered by Roentgen Used in medicine, industry and astronomy Can cause cancer MAP TAP The Electromagnetic Spectrum 18

19 MAP TAP The Electromagnetic Spectrum 19

20 Gamma rays Highest energy Blocked from Earth s surface by atmosphere MAP TAP The Electromagnetic Spectrum 20

21 MAP TAP The Electromagnetic Spectrum 21

22 MAP TAP The Electromagnetic Spectrum 22

23 Time to think.. 1. What is the relationship between frequency and wavelength? 2. What is meant by spectrum? 3. What does ROY G BIV mean? MAP TAP The Electromagnetic Spectrum 23

24 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? MAP TAP The Electromagnetic Spectrum 24

25 Think about it. You have just been involved in a traffic incident that leaves you stranded on the side of the road. Which part of the electromagnetic spectrum would be of the most use to you and why? MAP TAP The Electromagnetic Spectrum 25

26 Answers 1. Frequency and wavelength are properties of waves and since speed is constant for em waves, as frequency increases, wavelength decreases. 2. Spectrum is a continuum of all electromagnetic waves 3, ROY G BIV is the difference colors of the visible light in order of longest wavelength to shortest wavelength. 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. MAP TAP The Electromagnetic Spectrum 26

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