Q:

Why are gamma rays are able to penetrate “solid” walls but alpha or beta rays cannot? Because

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Why are gamma rays are able to penetrate “solid” walls but alpha or beta rays cannot? Because


  1. the speed of gamma rays (3 × 108 m/s) is very much faster than either alpha or beta radiation
  2. gamma rays do not have an electric charge whereas alpha is charged +2 and beta -1.
  3. to a gamma ray, the atoms of the wall appear to be mostly empty space.
  4. gamma rays possess much more energy than either alpha or beta rays.

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B: It is the absence of an electrical charge that allows photons to pass by electrons and atomic nuclei with being attracted or repelled by them. This means that photons are undeflected unless they suffer a direct hit.

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