electromagnetic waves
TRANSCRIPT
WavesMs. Shinkle
11/2-5, 2007
Types of Waves
• Mechanical Waves– Sound– Earthquake– Springs
• Electromagnetic– Light– Radio – X-ray
Electromagnetic Radiation
• Examples: Radio, TV, Microwave, X-Rays, Gamma Rays, Light, Ultraviolet, Infrared
• Do NOT need a medium– Can travel through space
• How astronomers observe the universe
How Fast?
• EMR is the fastest stuff around• Speed (“c”) is 3×108 m/s• All EMR travels at the same speed• Each type of EMR has a different
wavelength and frequency
A. Baseline E. Positive amplitudeB. Peak F. Negative amplitudeC. Peak to peak wavelength G. TroughD. Trough to trough wavelength
Wave Basics
Electromagnetic Spectrum
How do you make EMR?
• Just like any other wave, something has to move or vibrate
• Only now, it takes an electric charge (like an electron) that vibrates or moves
Wavicles
• EMR can act like a wave – it reflects, refracts, diffracts, etc.
• EMR can act like a particle (Photons)
• That’s what makes solar panels work. It’s called the Photoelectric Effect.
Visible Light in the EMR Spectrum