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Chapter 14/25

Chapter 14/25. Electromagnetic Waves. The Electromagnetic Spectrum. Figure 25-3 The Right-Hand Rule Applied to an Electromagnetic Wave. Figure 25-1 All Accelerating Charges Radiate Electromagnetic Waves. Receiving Radio Waves - Resonance. Maxwell - Electromagnetic waves.

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Chapter 14/25

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  1. Chapter 14/25 Electromagnetic Waves

  2. The Electromagnetic Spectrum

  3. Figure 25-3The Right-Hand Rule Applied to an Electromagnetic Wave

  4. Figure 25-1All Accelerating Charges Radiate Electromagnetic Waves

  5. Receiving Radio Waves - Resonance

  6. Maxwell - Electromagnetic waves All electromagnet waves travel at the speed of light in a vacuum

  7. Roses are Red, Violets are Violet 1 nanometer = 10 -9 meters Ex: 600 nm = 6.00 x 10-7m What is the speed of Light?

  8. Speed of Light • The speed of light can be defined as the speed it takes light to travel one meter in 1/299,792,458 of a second. • Presently, the speed of light has a fixed value of 299,792,458 m/s. or…….. • c = 3.00 × 108 m/s; c = f λ • Who measured the speed of light?

  9. c=f λ or v=f λ • A cell phone transmits at a frequency of 1.33 x 108 Hz. What is the wavelength of the electromagnetic wave used by this phone? • c = f λ • 3.00 × 108 m/s = 1.33 x 108 Hz (λ) • λ = 2.26 m

  10. Galileo One of the first attempts to measure the speed of light. What do you think he discovered? Conclusion: Light was really fast!!!!

  11. Romer: Using the moons of Jupiter to Determine the Speed of Light

  12. c=f λ • A television is tuned to a station broadcasting at a frequency of 7.30 x 107 Hz. For best reception, the rabbit-ear antenna used by the TV should be adjusted to have a tip-to-tip length equal to one-third a wavelength of the broadcast signal. Find the optimum length of the antenna. • c = f λ • 3.00 × 108 m/s = 7.30 x 107 Hz (λ) • λ = 4.11 m • So, 4.11/3 = 1.37 m

  13. Speed of Light

  14. Albert Michelson

  15. Figure 25-7Fizeau’s Experiment to Determine the Speed of Light

  16. Doppler Radar

  17. Microwaves • A microwave oven produces electromagetic waves with a wavelength of about 12 cm. What are the frequency of such waves? • c = f λ • 3.00 × 108 m/s = (f) 0.12 m • λ = 2.26 m

  18. Doppler: Red Shift / Blue Shift Which part of the Galaxy above will produce a Red Shift and Which part will produce a Blue Shift? Top Blue, Middle Red, Bottom Red

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