OCR AS Chemistry F331: Theory of Light

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The Particle Theory of Light
The behaviour of light should be thought of as particles.
Einstein regards light as a stream of tiny `packets' of energy called photons.
The energy of the photons is related to the position of the light in the electromagnetic
E.g. Photons with energy 3 x 1019 J correspond to red light
The two theories of light ­ the wave and the photon models ­ are linked by a relationship:
E = hv
E, the energy of a photon, is equal to the frequency of the light, on the wave model,
multiplied by a constant, h.
This is known as Planck Constant and has a value of 6.63 x 10 -34 J Hz-1
For a photon of red light with an energy of 3.0 x 10-19 J, the frequency is given by E=hv
Or 3.0 x 10-19 J = (6.63 x 10-34 J Hz-1) x v
So v = 3.0 x 10-19 J = 4.5 x 10-14 Hz
6.63 x 10-34 J Hz-1

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The Wave Theory of Light
Light is one form of electromagnetic radiation.
Like all electromagnetic radiation, it behaves like a wave with a characteristic wavelength
and frequency.
The speed of light: 3.00 x 10 ms1 when light it travelling in a vacuum.
Like all waves, the light wave has a wavelength and a frequency.
Different colours of light have different wavelengths.…read more


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