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Mrs. Brandt's 8th Grade Science

What is the release of particles and energy from nuclear decay? radioactivity
Why is carbon 14 radioactive? its ratio of protons to neutrons is not stable
On what does the stability of an isotope’s nucleus depend? the ratio of protons to neutrons
What radiation can be stopped with a sheet of paper? alpha particles
What is the time it takes for the ½ of the nucleus in a radioactive sample to decay? half-life
What is the process of changing one element into another through nuclear decay? transmutations
What do scientists use Carbon-14 for? to calculate the age of once living things EX: bones
What type of radiation penetrates thick metals and concrete? gamma rays
Name the three types of radiation. alpha, beta, gamma
Which type of particle occurs when high speed electrons are emitted from a nucleus? beta particles
What type of radiation can be stopped with a thin sheet of metal? beta radiation
What radiation is made of two protons and two neutrons? alpha radiation
What happens when the strong force is not big enough to hold the nucleus together? the nucleus decays or breaks down giving off radiation
What device detects radiation by producing a current and ‘clicking’? Geiger counter
What did Marie Curie discover? radioactive Radium and Polonium
Who discovered radioactivity and how? Bequerel with uranium and a photographic plate
What radiation is electromagnetic waves with high-frequency energy? gamma radiation
What causes protons and neutrons to be attracted to each other in the nucleus? strong force
Why is carbon-14 radioactive? its ratio of protons to neutrons is 6/8= .75. In order to be stable it needs to be 1.
How does carbon dating work? the ratio of C-12 to C-14 twlls how many half-lifes has passed
What is the process of splitting a nucleus into two smaller nuclei releasing a huge amounts of energy? nuclear fission
What is the process of combining together 2 nuclei with low masses to make one larger one? This also releases huge amounts of energy. nuclear fusion
What type of reaction is used in a nuclear power plant? Nuclear fission reaction
How is nuclear fission controlled in a power plant? control rods that absorb some of the neutrons which split atoms
What type of reaction takes place in the sun and stars? Nuclear Fusion reaction
What is the range of atomic numbers of elements whose isotopes are all radioactive? all elements past #83
Name cons to nuclear power. radioactive waste is produced and there is no way to store it, if something goes wrong, radioactivity is released into the environment
Name pros of nuclear power. lots of energy from little fuel, no pollutants into air, no carbon dioxide released into air
How is radioactivity useful in medicine? radioactive tracers used to detect problems, radiation can kill cancer cells
Know how to solve half-life problems and problems with radioactive or not elements!!! Know how to solve half-life problems and problems with radioactive or not elements!!!
Created by: mtoutant



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