Nature of Electromagnetic Waves

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Presentation transcript:

Nature of Electromagnetic Waves Chapter 3.1

Noteworthy Vocab. Electromagnetic Wave Radiant Energy Forces & Fields Magnetic & Electric Fields Atoms Protons, Electrons, Neutrons

Wave “Rewind” Waves transfer Energy without transferring Matter. Mechanical Waves transfer energy by making particles of matter collide with one another. Ex: Sounds waves, Waves in ocean Mechanical Waves can’t travel in space How do you transfer energy through empty space? Ex - Energy from Sun

Forces & Fields Earth has a force field = Gravitational Field Force is exerted on mass of object. Electromagnetic waves is produced by charged particles in motion. Electromagnetic Wave = Electric field + Magnetic Field

Magnetic Fields Magnets are surrounded by a magnetic force field. Magnets exert magnetic force on other magnets & magnetic materials. Magnetic fields cause magnetized materials to line up along magnetic lines.

Electric Fields Atoms contain protons, electrons, & neutrons. - Protons & Electrons have electric charge Protons => Positive; Electrons => Negative A particle with a charge is surrounded by an electric field. Electric field exerts a force on other charged particles.

Making Electromagnetic Waves Moving/Vibrating a charged particle back and forth causes changing electric and Magnetic Fields in many directions. Ex: Electron http://www.phy.ntnu.edu.tw/ntnujava/index.php?topic=35