Electron transition - PowerPoint PPT Presentation

Radiation Biophysics

Radiation Biophysics. By Amr A. Abd-Elghany, Ph.D. Atomic Structure. An atom is composed of electrons (with a negative charge), protons (with a positive charge) and neutrons (no charge).

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CHAPTER 19: OPTICAL PROPERTIES

CHAPTER 19: OPTICAL PROPERTIES. ISSUES TO ADDRESS. • What happens when light shines on a material ?. • Why do materials have characteristic colors?. • Why are some materials transparent and other not?. • Optical applications: --luminescence --photoconductivity --solar cell

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Sunbeds and stars...

Sunbeds and stars. Ionization, excitation and line spectra. Electron absorbs energy and…. Incident radiation. Hydrogen Atom. p. e. Ionisation!. e. Is able to completely escape from the atom . p. Energy = 0. Energy = -13.6eV. Ionisation!.

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231 views • 11 slides

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