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Visible Spectrum


Electromagnetic Spectrum Particle Description of Light Max Planck Albert Einstein Visible Spectrum Electromagnetic Spectrum Particle Description of Light Max Planck ... – PowerPoint PPT presentation

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Title: Visible Spectrum

Visible Spectrum
From longest to shortest wavelengths the colors
Red, 650-700 nm
Orange, 580-649 nm
Yellow, 575-579 nm
Green, 490-574 nm
Blue, 455-489 nm
Indigo, 425-454 nm
Violet, 400-424 nm
Electromagnetic Spectrum
Shortest wavelength Greatest frequency
Longest wavelength Lowest frequency
All wavelengths of light travel at the same
speed, the speed of light.
Wavelength and frequency are inversely
Particle Description of Light
(when the light given off is a stream of
particles - electrons - instead of light waves)
Photoelectric Effect
- emission of electrons from a metal when light
shines on the metal
Example much like a coke machine that requires
an exact coin before it will give back a coke.
Exact energy must be put in for electrons to be
given off.
Max Planck
  • German scientist
  • studied light given off by hot objects
  • didnt think waves were continuous
  • thought energy was given off in packets he called
  • Quantum minimum amount of energy that can be
    lost or gained by an atom

Relationship E h?
  • E energy in joules
  • frequency
  • H Plancks constant

Albert Einstein
  • expanded on Plancks theory
  • introduced idea that electromagnetic radiation
    has a dual wave-particle nature
  • each particle carries a quantum of energy
  • light acts like waves, but can also be like a
    stream of particles
  • Photon a particle of electromagnetic radiation
    having zero mass and carrying a quantum of energy

E1 photon (h) (?)
-where h Plancks constant, ? frequency and E
is the energy of 1 photon in joules
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