1 / 18

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.

monifa
Télécharger la présentation

Chapter 14/25

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 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

More Related