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Electromagnetic radiation with high energies and a typcial wavelength of less than 10 picometers.
1
vote
Would my house's wall stop gamma rays?
Whether or not a material stops or admits EM radiation is not an all-or-nothing affair. As you surmise, it depends on both material and on the frequency of radiation directed thereat, but what also ho …
24
votes
Why does a mirror reflect visible light but not gamma rays?
The reason why is based in something called the plasma frequency of the metal of a mirror. A metal, as you may know, is composed of a series of atom (ion, effectively) cores - nuclei, together with so …