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 – 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

Fluorescent lights

Whiter whites with fluorescence

X-rays X-rays are very high energy EMR that have high frequency and good penetrating ability Frequency is between and Hz

Penetrating ability of X-rays X-rays penetration ability is proportional to density Detector Source

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)

X-ray spectrum Continuous spectra and line emission spectra superimposed