1 / 37

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.

zena-washington
Download Presentation

Chapter 4

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

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

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

  11. 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

  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 • c =  • 

  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 =  •  •  = c ÷  = 3.00 x 108 m/s ÷ 665 x 10-9 m

  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 •  = 4.511278 x 1014/s or Hz

  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 •  = 4.51 x 1014/s or Hz

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

  17. 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

  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 • c =  • 

  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 =  •  •  = c ÷ = 3.00 x 108 m/s ÷ 7.25 x 1020/s

  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 •  = 4.137931 x 10-13 m

  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 •  = 4.14 x 10-13 m

  22. Energy of Waves

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

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

  25. 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

  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 • E = h •  = (6.63 x 10-34 J • s)(4.51 x 1014/s)

  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) • E = 2.99013 x 10-19 J

  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 = 2.99 x 10-19 J

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

  30. 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)

  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) • E = 4.80675 x 10-13 J

  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 • E = 4.81 x 10-13 J

  33.  =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

  34. 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.

  35. Homework • Chapter 4: Worksheet 2 (due in two days)

More Related