Physics, 21.08.2019 02:30, swordnewsnetwork
In lab #11 you worked with gamma rays of energy 661.659 kev emitted by a radioactive source 137 cs, which has a half-life of 30.17 years. the container enclosing the sample claims an activity of 0.5 pci nobody currently in the department knowns when the samples were purchased, so let's assume the claimed activity was correct 20 years ago. a) find the current activity of the source. express your answer in bequerels b) if you were to hold the source in your hand for the entire 110 minutes of lab (instead of actually doing the lab) how much energy would your hand adsorb, assuming perfect absorption. assume that the activity of the source does not measurably change in the 110 minutes c) how does your result in part (b) compare to your exposure to a typical dental -ray of 1014 ev per kilogram of tissue exposed? assume, for simplicity, that the mass of your hand. wrist, and part of your forearm, that is exposed to the 137cs is 1 kg. aside from the academic and intellectual danger of foregoing the laboratory experience, is holding the 137cs source physically dangerous? explain
Answers: 2
Physics, 22.06.2019 17:00, agelafa
Simon is writing a story about an astronaut whose spacecraft has been boarded by space pirates. the astronaut has her lucky penny in her hand behind her back as the space pirates break into the control room. she has just locked the controls so that the ship is accelerating in the direction of the control room’s ceiling. simon wants the astronaut to use the penny to hit a button on the control panel to turn off the lights and escape. the button is located a short distance behind and below the astronaut’s hands. how should simon use the theory of relativity to describe what the astronaut must do in order to hit the button?
Answers: 1
Physics, 22.06.2019 18:00, pleasedontspamme
Consider an ideal gas at 27.0 degrees celsius and 1.00 atmosphere pressure. imagine the molecules to be uniformly spaced, with each molecule at the center of a small cube. what is the length l of an edge of each small cube if adjacent cubes touch but don't overlap?
Answers: 2
In lab #11 you worked with gamma rays of energy 661.659 kev emitted by a radioactive source 137 cs,...
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