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Chapter 4

Chapter 4. The Electromagnetic Spectrum Part 1. Visible Light. Part of the Electromagnetic S p e c t r u m. All types of electromagnetic energy move in waves. Light and sound move by waves. Light moves at 3 x 10 8 m/s Sound moves at 340 m/s 1 mile = 1609 m.

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Chapter 4

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  1. Chapter 4 The Electromagnetic Spectrum Part 1

  2. Visible Light • Part of the Electromagnetic Spectrum

  3. All types of electromagnetic energy move in waves. • Light and sound move by waves. • Light moves at 3 x 108 m/s • Sound moves at 340 m/s • 1 mile = 1609 m

  4. All types of electromagnetic energy move in waves. • Light moves at 3 x 108 m/s • Sound moves at 340 m/s • Is sound a form of electromagnetic radiation?

  5. Electromagnetic Waves • Properties of waves include speed, frequency and wavelength • All electromagnetic waves including light travel at a speed of 3 x 108 m/s.

  6. Wavelength () Measured in units of length: m, nm, A º

  7. Frequency () Measured in cycles/second = hertz (Hz)

  8. Visible Light

  9. Why do we want to understand electromagnetic radiation (light)? • Well, for one thing, it may someday allow us to become invisible.

  10. Electromagnetic Radiation • For all waves  •  = c • c = the speed of light = 3.00 x 108 m/s

  11. A photon of red light has a wavelength of 665 nm. What is the frequency of this light?

  12. A photon of red light has a wavelength of 665 nm. What is the frequency of this light? • 665 nm = 665 x 10-9 m

  13. A photon of red light has a wavelength of 665 nm. What is the frequency of this light? • 665 nm = 665 x 10-9 m • c =  • 

  14. A photon of red light has a wavelength of 665 nm. What is the frequency of this light? • 665 nm = 665 x 10-9 m • c =  •  •  = c ÷  = 3.00 x 108 m/s ÷ 665 x 10-9 m

  15. A photon of red light has a wavelength of 665 nm. What is the frequency of this light? • 665 nm = 665 x 10-9 m • c =  •  •  = c ÷  = 3.00 x 108 m/s ÷ 665 x 10-9 m •  = 4.511278 x 1014/s or Hz

  16. A photon of red light has a wavelength of 665 nm. What is the frequency of this light? • 665 nm = 665 x 10-9 m • c =  •  •  = c ÷  = 3.00 x 108 m/s ÷ 665 x 10-9 m •  = 4.511278 x 1014/s or Hz •  = 4.51 x 1014/s or Hz

  17. An x-ray has a frequency of 7.25 x 1020 Hz. What is the wavelength?

  18. An x-ray has a frequency of 7.25 x 1020 Hz. What is the wavelength? • 7.25 x 1020 Hz = 7.25 x 1020/s

  19. An x-ray has a frequency of 7.25 x 1020 Hz. What is the wavelength? • 7.25 x 1020 Hz = 7.25 x 1020/s • c =  • 

  20. An x-ray has a frequency of 7.25 x 1020 Hz. What is the wavelength? • 7.25 x 1020 Hz = 7.25 x 1020/s • c =  •  •  = c ÷ = 3.00 x 108 m/s ÷ 7.25 x 1020/s

  21. An x-ray has a frequency of 7.25 x 1020 Hz. What is the wavelength? • 7.25 x 1020 Hz = 7.25 x 1020/s • c =  •  •  = c ÷ = 3.00 x 108 m/s ÷ 7.25 x 1020/s •  = 4.137931 x 10-13 m

  22. An x-ray has a frequency of 7.25 x 1020 Hz. What is the wavelength? • 7.25 x 1020 Hz = 7.25 x 1020/s • c =  •  •  = c ÷ = 3.00 x 108 m/s ÷ 7.25 x 1020/s •  = 4.137931 x 10-13 m •  = 4.14 x 10-13 m

  23. Energy of Waves

  24. Energy of Electromagnetic Radiation • For all waves: E=h •  h = 6.63 x 10-34 J • s or J/Hz

  25. A photon of red light has a wavelength of 665 nm. What is the energy of this light?

  26. A photon of red light has a wavelength of 665 nm. What is the energy of this light? • 665 nm = 665 x 10-9 m • c =  •  •  = c ÷  = 3.00 x 108 m/s ÷ 665 x 10-9 m •  = 4.511278 x 1014/s or Hz •  = 4.51 x 1014/s or Hz

  27. A photon of red light has a wavelength of 665 nm. What is the energy of this light? • 665 nm = 665 x 10-9 m • c =  •  •  = c ÷  = 3.00 x 108 m/s ÷ 665 x 10-9 m •  = 4.511278 x 1014/s or Hz •  = 4.51 x 1014/s or Hz • E = h •  = (6.63 x 10-34 J • s)(4.51 x 1014/s)

  28. A photon of red light has a wavelength of 665 nm. What is the energy of this light? • 665 nm = 665 x 10-9 m • c =  •  •  = c ÷  = 3.00 x 108 m/s ÷ 665 x 10-9 m •  = 4.511278 x 1014/s or Hz •  = 4.51 x 1014/s or Hz • E = h •  = (6.63 x 10-34 J • s)(4.51 x 1014/s) • E = 2.99013 x 10-19 J

  29. A photon of red light has a wavelength of 665 nm. What is the energy of this light? • 665 nm = 665 x 10-9 m • c =  •  •  = c ÷  = 3.00 x 108 m/s ÷ 665 x 10-9 m •  = 4.511278 x 1014/s or Hz •  = 4.51 x 1014/s or Hz • E = h •  = (6.63 x 10-34 J • s)(4.51 x 1014/s) • E = 2.99013 x 10-19 J = 2.99 x 10-19 J

  30. An x-ray has a frequency of 7.25 x 1020 Hz. What is its energy?

  31. An x-ray has a frequency of 7.25 x 1020 Hz. What is it’s energy? • E = h •  = (6.63 x 10-34 J/Hz)(7.25 x 1020Hz)

  32. An x-ray has a frequency of 7.25 x 1020 Hz. What is it’s energy? • E = h •  = (6.63 x 10-34 J/Hz)(7.25 x 1020Hz) • E = 4.80675 x 10-13 J

  33. An x-ray has a frequency of 7.25 x 1020 Hz. What is it’s energy? • E = h •  = (6.63 x 10-34 J/Hz)(7.25 x 1020Hz) • E = 4.80675 x 10-13 J • E = 4.81 x 10-13 J

  34.  =665 x 10-9 m  = 4.51 x 1014 Hz E = 2.99 x 10-19 J  =4.14 x 10-13 m  = 7.25 x 1020 Hz E = 4.81 x 10-13 J wavelength, frequency and energy Red Light X-ray

  35. Wavelength, frequency and energy • Wavelength and frequency have an indirect relationship. • Energy and frequency have a direct relationship. • Electromagnetic radiation with a shorter wavelength will have a higher frequency and higher energy. • Electromagnetic radiation with a longer wavelength will have a lower frequency and lower energy.

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