electromagnetic spectrum. the electromagnetic spectrum covers a wide range of wavelengths and photon...
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Electromagnetic Spectrum
The electromagnetic spectrum covers a wide
range of wavelengths and photon energies.
Two types of wavesTransverse (no medium required)
andCompression (must have a medium)
Wavelength:the distance between two identical points on two adjacent
waves
Frequency is the number of wave crests that pass a point
during one second.
These waves go from Large to smallRadio
MicrowavesInfrared
Visible LightUltraviolet
X-RaysGamma Radiation
Electromagnetic waves are produced by the motion of electrically charged particles
Particle Wave Duality: Electomagnetic radiation acts as a wave but also as a particles (“Photons” which is a stream of particles that has no mass.)
Visible Light
Why is the sky blue?
Why is the sky blue?Rayleigh Scattering
Rayleigh Scattering: light hits gas molecules and the different
frequencies are all effected differently.Higher frequencies (blue) are
absorbed much more often then lower frequencies (red)
The gas will eventually radiate the blue light back out scattering it out
making the sky appear blue.
Why do you get different colors at
sunset or when there are more clouds in the
sky?
Ticket out the door1. What is the largest wavelength
we know about?2. Are light wave transverse or
compression waves?3. Why is the sky blue?