Which of the following materials is most effective for stopping gamma radiation? explain how you got your answer single sheet of paper one cm of water several cm of lead single sheet of aluminum foil

Several centimeters of lead. Gamma rays have the highest penetrating power and therefore need a thick layer of something, in most cases lead, to prevent penetration. (This is why if you have ever go to the dentist they put a heavy thing on you made of lead, to prevent the penetration of gamma rays that can destroy your most important organs).

High-energy and unstable.

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