1cat2ferrets Posted May 24, 2010 Share Posted May 24, 2010 1. If a beam of visible light causes a piece of metal to eject electrons, do you think that a beam of gamma rays would cause the metal to eject electrons? Why or why not? 2. The first scientists who worked with radioactive materials in the late 19th and 20th centuries did not realize how dangerous radiation was to their health. For example, 1903 nobel prize winner henri becquerel once placed a radioactive sample of barium in a glass tube, wrapped it in paper, put it in a cardboard box, and then left it in the jacket pocket of the coat he was wearing for 6 hours. When he removed the jacket, he discovered, to his surprise, that the radiation from the sample had burned his skin. What kind of radiation was responsible for becquerel's burn? How do you know? TIA for any help! Quote Link to comment Share on other sites More sharing options...
1cat2ferrets Posted May 24, 2010 Author Share Posted May 24, 2010 A carbon sample taken from the bone of a saber-tooth tiger emits 1 beta emission a minute. A carbon sample of the same size taken from a fresh piece of bone emits 16 beta emissions a minute. How long ago did the saber-tooth tiger live? Show your calculations. OK, that's it. TIA once again. Quote Link to comment Share on other sites More sharing options...
1cat2ferrets Posted May 24, 2010 Author Share Posted May 24, 2010 BUMP!!! Quote Link to comment Share on other sites More sharing options...
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