CHEM 1E03 Lecture Notes - Lecture 2: Work Function, Photon
22 Oct 2018
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Start at the bottom: matter is made of atoms (and ions). Properties of atoms and ions are determined by their electronic structure the arrangement of the electrons. To understand how we can know about the electronic structure of atoms, we must first learn about light. It is through the interaction of light and matter that the electronic structure of atoms are elucidated. Light is an electromagnetic wave which carries energy. Different colours of light correspond to different wavelengths (and frequencies). In one period, t, one wavelength passes an observation point. The wave travels one wavelength which equals c x t, where c is the speed of light. Frequency, , is the number of peaks passing the observation point per unit time. The si unit of frequency is hz, (1 hz = 1s^-1). Wavelength is the distance between peaks measured in m. nanometers (1nm = 10^-9m) are often used in the case of visible light.
