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Lesson : Electcromagnetic Spectrum (EMS)

Lesson : Electcromagnetic Spectrum (EMS). Parts of a wave. Wavelength – Distance between two corresponding points on successive waves. Amplitude – measure of a wave’s “strength” (height of crest or trough). The Wave-like Electron.

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Lesson : Electcromagnetic Spectrum (EMS)

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  1. Lesson: Electcromagnetic Spectrum (EMS)

  2. Parts of a wave Wavelength – Distance between two corresponding points on successive waves. Amplitude – measure of a wave’s “strength” (height of crest or trough).

  3. The Wave-like Electron The electron propagates through space as an energy wave. To understand the atom, one must understand the behavior of electromagnetic waves. Louis deBroglie

  4. Electromagnetic Wave– An electric wave and magnetic wave moving at right angles to each other.

  5. Electromagnetic Spectrum – Arrangement of all forms of electromagnetic radiation in order of frequency and wavelength.

  6. Frequency (ν): number of wavelengths that pass a certain point in a given amount of time. - units are Hertz (Hz) • If these 2 waves are traveling at equal speeds, which wave will have more wavelengths cross the finish line in one minute? low frequency = long wavelength FINISH high frequency = short wavelength

  7. If these 2 waves are traveling at equal speeds, which wave will have more wavelengths cross the finish line in one minute? low frequency = long wavelength FINISH high frequency = short wavelength

  8. Left Side Practice • 1) Pick a type of wave on the EMS (not visible light). • 2) Draw a pic of that wave and label the crest, trough, wavelength and amplitude. • 3) Write and answer these questions: • Does it have a greater wavelength than visible light? • Does it have a higher frequency than visible light? • Does it have more or less energy than visible light?

  9. 3) Write and answer these questions: Does it have a greater wavelength than visible light? Does it have a higher frequency than visible light? Does it have more or less energy than visible light?

  10. Warm Up 10/17 Which has the greatest: Wavelength? Frequency? Energy?

  11. All waves on the EMS travel at the speed of light (c). • c = speed of light = 3.00 x 108 m/s. c = λ x f • Wavelength (λ) and frequency (f)are inversely related. • to solve for λ … c = • to solve for f… λ f c f = λ

  12. Practice Calculate the υ of a wave that has a wavelength of 5.00 x 10-6 m. c ν Hz = ν = ν = λ Does this radiation have a shorter or longer λ than red light?

  13. Practice What is the wavelengthof radiation with a frequency of 1.50 x 1013 Hz? c λ = = λ ν λ =

  14. On Your Own Practice • Calculate the wavelength of yellow light emitted by a sodium lamp, if the frequency of the radiation is 5.10 x 1014 Hz. * Hint: Be sure you set up the right equation. Ask yourself: which variable am I solving for?

  15. CreateYour Own Problem • Create a problem so that you have to solve for frequency (f). To do that, just make up a wavelength (between 10 and 10 . Solve it for yourself, then find one other person to solve it and check your work. Be sure to write your question as a word problem. 4 -12

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