'Incident gamma ray' presentation slideshows

announcement: next week only : office hours Tuesday 2-4

announcement: next week only : office hours Tuesday 2-4. X-ray astronomy. - with X-rays one normally uses energies instead of wavelengths eg 1 < E x < 100 keV use E = h n = hc/ l to convert - a photon with energy 1 keV has a wavelength of 1.3 nm high energy astrophysics.

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