Characteristics of light; Arianna and Zeke

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Characteristics of light; Arianna and Zeke

  1. 1. Characteristics of Light By Arianna Lammers and Zeke DuPree
  2. 2. Overview • Electromagnetic Wave • How to calculate the frequency or wavelength of electromagnetic radiation • Recognize that light has a finite speed • Describe how the brightness of light source is affected by distance
  3. 3. Introduction In this lesson, we will learn about the Electromagnetic Spectrum, the frequency and wavelength of the Spectrum, and how distance affects light!
  4. 4. What is the Electromagnetic Spectrum? Radio Waves • Types of Transmitters(depending on wavelength) • Main uses: communication ● Dangers: Large doses are believed to cause cancer
  5. 5. What is the Electromagnetic Spectrum? • Microwaves Extremely high frequency radio waves ● Main uses: cooking, mobile phones, speed cameras, and radars ● Dangers: cataracts and affect parts of your brain Should you worry about using your phone now?
  6. 6. WARNING!!! DON’T MAKE A HABIT OF PRESSING YOUR FACE TO THE MICROWAVES DOOR!!!
  7. 7. What is the Electromagnetic Spectrum? Infrared ● Infra means “below”. Infrared is below visible red light ● Main uses: remote controls, heal sport injuries, night sight, and thermal sighting ● Danger- OVERHEATING!
  8. 8. What is the Electromagnetic Spectrum? • • Light Tiny part and visible light Main uses: See things, laser, Laser printer, and weapon aiming systems ● Dangers: Damage your retina
  9. 9. What is the Electromagnetic Spectrum? • Ultraviolet Given off by the sun ● Main uses: Sun tan, detecting forged bank notes, and kills microbes ● Dangers: Damage the retina, sunburns and skin cancer
  10. 10. What is the Electromagnetic Spectrum? • • • X-Rays High frequency waves and carries a lot of energy Main uses: See inside people, airport security, and astronomers Dangers: Cell damage and cancer
  11. 11. What is the Electromagnetic Spectrum?
  12. 12. What is the Electromagnetic Spectrum? Gamma Rays ● Stars and radioactive substancesdifficult to stop ● Main uses: Kill cancer cells, radiotherapy, tracers, and,targeted radiotherapy ● Dangers: Cell damage and mutations
  13. 13. Components of the Electromagnetic Spectrum
  14. 14. Calculating Frequency of Electromagnetic Radiation λν = c What is the frequency of infrared radiation of wavelength 67.5 μm? 1) Convert μm to m 67.5 μm = 67.5 x 10-6 m 2) Use λν = c to determine the frequency: (67.5 x 10-6 m) (x) = 3.00 x 108 m/s x = 4.44 x 1012 s-1
  15. 15. Calculating wavelength of Electromagnetic Radiation λν = c When an electron beam strikes a block of copper, xrays of frequency 1.07 x 1019 Hz are emitted. What is the wavelength of these x-rays? Answer in units of pm. 1) Substitute into λν = c: (x) (1.07 x 1019 s¯1) = 3.00 x 108 m s¯1 x = 2.80 x 10¯11 m 2) Convert from m to pm: 2.80 x 10¯11 m x (1012 pm / 1 m) = 28 pm
  16. 16. Light has finite speed • 300,000,000 m/s is the speed of light. • Light is an electromagnetic wave ● A wave takes time to get from one point to another ● Infinite light: would have to be everywhere at once unlike a wave
  17. 17. Brightness of Light Source is Affected by Distance Scientist have calculated that when distance doubles, the brightness of the sources is decreased by a factor of four. I= 2 C/d The C in the equation represents the constant of the wattage of your source.
  18. 18. These waves are used to inspect luggage in airport security Review! These waves have the longest wavelength in the EM spectrum X-Rays Radio Waves Used for mobile phones and radar The highest frequency waves in the EM spectrum Gamma Rays The waves used for TV remote controls Microwaves These waves make your gin & Infrared tonic glow. (If you're old enough Emitted by the laser in CD & DVD drives for alcohol, anyway.) Ultraviolet Light
  19. 19. Any Questions??
  20. 20. Bibliography Brightness and Distance. (n.d.). Brightness and Distance. Retrieved October 25, 2013, from http://cosmology.berkeley.edu/Education/Projects/Desktop_Stars/DTS/ISQ/Discussion.html Calculate the frequency when given the wavelength. (n.d.). Calculate the frequency when given the wavelength. Retrieved October 25, 2013, from http://www.chemteam.info/Electrons/calc-freq-givenwavelength.html Reucroft, S., & Swain, J. (n.d.). Why isn't the speed of light infinite?: Scientific American. Why isn't the speed of light infinite?: Scientific American. Retrieved October 25, 2013, from http://www.scientificamerican.com/article.cfm?id=why-isnt-the-speed-of-lig Science and Nature: TV and Radio Followup. (n.d.). BBC News. Retrieved October 25, 2013, from http://www.bbc.co.uk/sn/tvradio/programmes The Electromagnetic Spectrum: Home page. (n.d.). The Electromagnetic Spectrum: Home page. Retrieved

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