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**Wave Nature of Light and Quantum Theory**

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**The Wave Nature of the Light**

Atomic structure elucidated by interaction of matter with light. Light properties: characterized by wavelength, , and frequency,. Light = electromagnetic radiation, a wave of oscillating electric and magnetic influences called fields. John A. Schreifels Chemistry 211

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Properties of Light Frequency and wavelength inversely proportional to each other. c = where c = the speed of light = 3.00x108 m/s; units = s1, = m

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**Practice Calculate the frequency of light with a wavelength of 500 nm.**

Calculate the frequency of light if the wavelength is 400 nm.

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**Quantized Energy and Photons**

Light = wave arriving as stream of particles called "photons". Each photon = quantum of energy Photoelectric effect simulation John A. Schreifels Chemistry 211

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**Planck’s Equation where h (Planck's constant) = 6.63x1034J*s.**

An increase in the frequency = an increase in the energy An increase in the wavelength gives an decrease in the energy of the photon. the energy of the electron is directly related to the energy of the photon.

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**Determine the energies of photons with**

Practice Determine the energies of photons with wavelengths of 650 nm, 700 nm and frequencies 4.50x1014 s1, 6.50x1014 s1

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