geiger counter
prepared. A student measures the radioactivity of this source with a Geiger counter and observes 1500 counts per minute. She notices that the source was prepared 120 days before her lab. What fraction of the decays is she observing with her apparatus? b Identify some of the reasons that only a fraction of the s emitted are observed by the detector. Armor-piercing shells with depleted uranium cores are fired by aircraft at tanks. The high density of the uranium makes them effective. The uranium is called depleted because it has had its 235 U removed for reactor use and is.
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