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The Electromagnetic Spectrum
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- 2. The electromagnetic spectrumis the complete spectrum (or continuum) of all forms of “light” An electromagnetic wave consists of electric and magnetic fields which vibrate - thus making waves. Vibrations
- 3. The electromagnetic spectrumconsists of: radio waves cell phone waves microwaves radar waves infrared waves visible light waves ultraviolet waves x-ray waves gamma waves The Electromagnetic Spectrum
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- 5. Properties of electromagneticwaves include speed , frequency and wavelength Speed (s), frequency (f) and wavelength ( ) are related in the formula: s = f x All light waves travel at a speed of 3 x 10 8 m/s in a vacuum The Electromagnetic Spectrum
- 6. All parts ofthe electromagnetic spectrum travel at the same speed Therefore, wavelength and frequency have an indirect relationship. This means that as one characteristic increases, the other decreases In other words, as wavelength increases, frequency decreases The Electromagnetic Spectrum
- 7. As wavelength decreases,frequency will? increase See the relationship The Electromagnetic Spectrum
- 8. Electromagnetic wave characteristics:short wavelengths have a high frequency long wavelengths have a low frequency Electromagnetic waves & Energy: high frequency waves have high energy low frequency waves have low energy The Electromagnetic Spectrum
- 9. Fill in thetable below: The Electromagnetic Spectrum wavelength frequency energy long high
- 10. The Electromagnetic Spectrumincreasing frequency increasing energy If you haven’t already, sketch this drawing into your notes. Don’t worry so much about the actual wavelengths, just get the general shape and where the various forms of light (radio, infrared, x-ray, etc) exist. smaller wavelengths
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- 12. Longer than radio,shorter than infrared or visible light Wavelength 1 x 10 - 4 m to 1 x 10 -1 m used for communication, medicine and consumer use (microwave ovens) The Electromagnetic Spectrum
- 13. Low energy waveswith 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. The Electromagnetic Spectrum
- 14. Invisible electromagnetic wavesthat 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 The Electromagnetic Spectrum
- 15. The portion ofthe electromagnetic spectrum that human eyes can detect ROY G BIV (red, orange, yellow, green, blue, indigo, violet) Which color has the lowest frequency? red has the lowest frequency – violet the highest The Electromagnetic Spectrum
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- 17. Higher energy thanlight waves Can cause skin cancer and blindness in humans Used in tanning beds and sterilizing equipment The Electromagnetic Spectrum
- 18. High energy wavesUsed in medicine, industry and astronomy Can cause cancer The Electromagnetic Spectrum
- 19. Highest energy Blockedfrom Earth’s surface by atmosphere The Electromagnetic Spectrum
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- 21. What is therelationship between frequency and wavelength? What characteristic of gamma waves gives them their high energy? What does ROY G BIV mean? What part of the electromagnetic spectrum does it refer to? The Electromagnetic Spectrum
- 22. Which color ismore energetic, red or yellow? Which type of wave travels faster, gamma or radio? Why are microwaves more dangerous than radio waves? The Electromagnetic Spectrum
- 23. You have justbeen 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? The Electromagnetic Spectrum
- 24. Frequency and wavelengthare properties of waves and since speed is constant for em waves, as frequency increases, wavelength decreases. In other words, they have an indirect relationship. Gamma waves get their high energy from their extremely short wavelengths (or extremely fast frequency) ROY G BIV stands for “red, orange, yellow, green, blue, indigo, and violet. They are the colors of the visible light in order of longest wavelength to shortest wavelength. Yellow is more energetic than red because it has a shorter wavelength (or larger frequency) Gamma waves and radio waves travel at the same speed Microwaves are more dangerous than radio waves because they have a higher frequency and carry more energy. The Electromagnetic Spectrum