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physical scien 8

flash cards for chapter 16

QuestionAnswer
During alpha decay what does Ra-226 decay into? Radon-222, and He-4 charges +86 and +2.
How long does U-238 take to decay (half-life)? 4,500,000,000 years
C-14 during beta decay decays into what and what? N-14,charge +7 and a beta particle which is an electron, charge -1
What stops alpha, beta, and gamma particles in fig 5 on page 451? 7cm of paper or clothing stops alpha particles, 3mm of aluminum stops the more penetrating beta particles,and cms or kms of lead or concrete stop the deadliest most penetrating gamma particles.
Using fission as in a neutron on U-235 what two elements come apart? Barium-142, and Krypton-91.
What noble gas is produced during the nuclear fusion of H? Helium 4 and some energy.
What 1980s meltdown took place in Ukrane caused too much radiation and a major evacuation? Chernobyl nuclear plant in the Soviet Union.
The heaviest naturally occuring element, uranium has a half-life of 4 1/2 billion years. How many years for 1/16( four half-lives) of uranium to remain? 18,000,000,000 years for 4 half-lives.
Created by: PS 8
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