Earth’s Energy Balance. We are Sun Powered. Earth is warmed by the sun Exception: geothermal energy The Sun adds 342 Watts of energy per square meter of earth every year Energy from the sun radiates through space as electromagnetic waves. Image source: science. NASA.gov.By frey
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Table of Contents. Electromagnetic Waves. Section 1 • What are electromagnetic waves?. Section 2 • The Electromagnetic Spectrum. Section 3 • Radio Communication. Waves in Matter. Waves are produced by something that vibrates, and they carry energy from one place to another.
Electromagnetic Waves. James Clerk Maxwell, a 19th-century physicist, developed a theory that explained the relationship between electricity and magnetism and correctly predicted that visible light is caused by electromagnetic waves. (credit: G. J. Stodart ). Generation and Detection of EM wave.
Electromagnetic Waves. All electromagnetic waves travel at the same speed through space (the speed of light) Gamma rays, X-rays, Ultra-violet waves, Light, Infra-red rays, Microwaves, and Radio waves are all electromagnetic waves with different wavelengths
Electromagnetic Waves. Maxwell’s Equations Maxwell’s Displacement Current Animation – EM Waves Properties of EM Waves Electromagnetic Spectrum Radio Frequency Spectrum Encoding Information. Maxwell’s Equations. Google Wikipedia. missing term!. Maxwell’s Displacement Current.
Electromagnetic Waves. G3 Two Source Interference of Waves G4 The Diffraction Grating. Recap: Superposition (interference)
Chapter 24. Electromagnetic Waves. Background Notes: Light - what is it? Particles or Waves?. 200 year debate started in 1700’s. Supposedly settled in 1802. Finally resolved in early 1900’s. Before the 1700’s!. The Particle Theorists. Pierre Simon Laplace (1749-1827). Sir Isaac Newton
ELECTROMAGNETIC WAVES. Electromagnetic Waves Properties of Electromagnetic Waves Hertz Experiment Electromagnetic Spectrum - Wavelength and Frequency Range - Sources and Uses. = -. j B z. d Φ B. d Φ E. j B z. j E y. j E y. = - μ 0 ε 0. l. E . d l. B . d l. l. j t.
Electromagnetic Waves. Electromagnetic Waves- transverse waves consisting of changing electric fields and changing magnetic fields Electric Field- a region of space exerts electric forces on charged particles Magnetic Field- a region of space produces magnetic forces.