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Fluorescence and X rays. Physics 3AB Mr. D. Patterson. Outcomes. explain fluorescence and the generation of X-rays—this includes applying the relationships :. Relevance of fluorescence and X-rays. Bohr’s model. HYDROGEN. Fluorescence. Ways to emit light from atoms in a gas: Heat it up
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Fluorescence and X rays Physics 3AB Mr. D. Patterson
Outcomes explain fluorescence and the generation of X-rays—this includes applying the relationships:
Bohr’s model HYDROGEN
Fluorescence • Ways to emit light from atoms in a gas: • Heat it up • Apply an electric current • Hit it with light or other EMR
Fluorescence • Fluorescence is the emission of light caused by the absorption of EMR • Wavelengths are equal or longer than incident EMR • Energy is less or equal to incident EMR
X-rays • X-rays are very high energy EMR that have high frequency and good penetrating ability • Frequency is between 1017 and 1019 Hz
Penetrating ability of X-rays X-rays penetration ability is proportional to density Source Detector
Dangers of X-rays They have the ability to ionise atoms Can cause cancerous cell growth through damaging DNA
X-ray production X-rays are produced by fast moving electrons suddenly losing their kinetic energy, releasing photons (X-rays)
Slowing down the electron Ionising inner electrons
X-ray spectrum Continuous spectra and line emission spectra superimposed Characteristic peaks depend on target metal