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| Description: Most helium nuclei (originally called alpha particles) entering a thin foil scatter slightly as they pass through the medium, but some scatter backward, indicating that they have encountered very dense, compact objects. Such experiments were the first evidence that most matter is concentrated in what are now called atomic nuclei. Picture Stats: Views: 782 Filesize: 238.95kB Height: 900 Width: 1315 Source: https://biology-forums.com/index.php?action=gallery;sa=view;id=15929 |