fluorescence and x rays physics 3ab mr. d. patterson
TRANSCRIPT
Fluorescence and X rays
Physics 3ABMr. 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 1017 and 1019 Hz
Penetrating ability of X-rays• X-rays penetration
ability is proportional to density
Detector
Source
Dangers of X-raysThey 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