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handout_L12_EM - Lecture 12 Electromagnetic Radiation...

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Lecture 12: Electromagnetic Radiation Reading: Zumdahl 12.1, 12.2 • Outline – The nature of electromagnetic radiation. – Light as energy. – The workfunction of metals. Electromagnetic Radiation Electromagnetic radiation or “light” is a form of energy. Characterized by: –Wavelength ( λ ) –Amplitude (A) Has both electric (E) and magnetic (H) components. Electromagnetic Radiation (cont.) Electromagnetic Radiation (cont.) Wavelength ( λ ): The distance between two consecutive peaks in the wave. Increasing Wavelength λ 1 > λ 2 > λ 3 Unit: length (m) Electromagnetic Radiation (cont.) Frequency ( ν ): The number of waves (or cycles) that pass a given point in space per second. Decreasing Frequency ν 1 < ν 2 < ν 3 Units: 1/time (1/sec) Electromagnetic Radiation (cont.) The product of wavelength ( λ ) and frequency ( ν ) is a constant. ( λ )( ν ) = c Speed of light c = 3 x 10 8 m/s
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Electromagnetic Radiation (cont.) We classify electromagnetic radiation by wavelength.
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