Chapter 5. Electrons in Atoms. Wave Nature of Light. Electromagnetic radiation which is a form of energy that exhibits wavelike behavior as it travels through space. Examples: light, radio waves, x-rays, etc. Parts of a Wave. crest. wavelength. amplitude. origin. amplitude.
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Electrons in Atoms
c = lf
High frequency, Short Wavelength
Low frequency, Long Wavelength
Speed of light = (wavelength) x (frequency)
f = 3.44 x 109 Hz
c = 3.00 x 108 m/s
3.00 x 108 m/s = (3.44 x 109 s-1)
3.00E8 / 3.44E9 = 8.72 x 10-2 m
Energy = (Planck’s constant)(frequency)
E = hf
Example: What is the energy in Joules of a photon from the violet portion of the rainbow if it has a frequency of 7.23 x 1014 Hz?
E = ?
h = 6.626 x 10-34Js
f = 7.23 x 1014 Hz (or s-1)
E = (6.626 x 10-34Js)(7.23 x 1014 s-1)
E = 4.79 x 10-19 J