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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

Fluorescence and X rays

Physics 3AB

Mr. D. Patterson


Outcomes
Outcomes

explain fluorescence and the generation of X-rays—this includes applying the relationships:



Bohr s model
Bohr’s model

HYDROGEN


Fluorescence
Fluorescence

  • Ways to emit light from atoms in a gas:

    • Heat it up

    • Apply an electric current

    • Hit it with light or other EMR


Fluorescence1
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

  • 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
Penetrating ability of X-rays

X-rays penetration ability is proportional to density

Source

Detector


Dangers of x rays
Dangers of X-rays

They have the ability to ionise atoms

Can cause cancerous cell growth through damaging DNA


X ray production
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
X-ray spectrum

Continuous spectra and line emission spectra superimposed

Characteristic peaks

depend on target metal


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