Chapter 26. Properties of Light. Electromagnetic Waves. Traveling, oscillating, electric and magnetic fields which are emitted by vibrating charges. The electric and magnetic fields carry energy.
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Properties of Light
The speed of light = constant in vacuum
c 3.00 x 108 m/s = 300,000,000m/s
fred =4.29 x 1014Hz
f violet= 7.50 x 1014Hz
Most glass is made up of atoms (Si and other elements).
They possess electrons that have natural frequencies of vibration that closely match the frequency of ultra-violet (UV)light.
(1015- 1017) Hz
The larger atoms and molecules will vibrate at lower IR frequencies. So if IR is present, it will also be absorbed with the energy being dissipated as heat.
Visible light is transmitted
UV & IR get absorbed
Any bending of light by means other than reflection and refraction is called diffraction.
Two or more slits
Thin Film Phenomena – Constructive and destructive Interference
The alignment of the transverse waves.
Medium Average speed
Vacuum c = 3 x 108 m/s
Water v = 0.75c
Glass v = 0.67c
Diamond v = 0.41c
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