Reacciones y Cambios Química nuclear I: Radiation, half-life, and nuclear reactions por Judi Luepke, PhD. Lectura Prueba Enseñe con esto 1. Which discovery first led to experiments that helped scientists understand the structure of the atom and the nature of subatomic particles? Becquerel's accidental discovery of radiation Rutherford's discovery of alpha and beta particles Villard's discovery of gamma rays Curies' discovery of radium and polonium 2. Which scientist received a Nobel prize for work on spontaneous radiation and radioactivity, despite bias and prejudice? Pierre Curie Madame Curie Henri Becquerel Ernest Rutherford 3. What are radioisotopes? Stable atoms of the same element with different numbers of neutrons Stable atoms of the same element with different numbers of protons Unstable atoms of the same element with different numbers of neutrons Unstable atoms of the same element with different numbers of protons 4. Which type of radioactive decay is shown in this model? CC BY-SA 4.0 Yuri Tungsten Alpha Beta Gamma Decay chain 5. Which type(s) of radioactive decay can be stopped by a sheet of aluminum metal? Alpha Alpha, beta Alpha, beta, gamma Gamma 6. Which type of radioactive decay is shown in this model? CC BY-SA 4.0 MikeRun Alpha Beta Gamma Decay chain 7. Why are the Curies' laboratory notebooks still radioactive? Ra-226 has a half-life of 1600 years and will not be totally decayed for thousands of years. Ra-226 has a half-life of 3200 years and will not be totally decayed for thousands of years. After 1600 years, only one-fourth of the original amount of Ra-226 has decayed. After 3200 years, only one-eighth of the original amount of Ra-226 has decayed. 8. Why do some radioisotopes decay quickly and others take more time? Half-life is a unique property of radioisotopes, but it takes only one decay process for the radioisotope to become stable. Half-life is a unique property of radioisotopes, and it may take many decay processes for the radioisotope to become stable. Half-life is 1600 years which is a long time. Half-life can range from milliseconds to hundreds of years. 9. Which statement is true about the radioisotope in this half-life graph? CC BY-SA 4.0 Brightyellowjeans It has a half-life of about 1 second. It has a half-life of about 3 seconds. It has a half-life of about 7 seconds. It has a half-life of about 10 seconds. 10. What was one of the first uses of radium that still exists today? Wonder drug in cosmetics Additive in drinking water Branding of household products Shrinkage of cancerous tumors Resultados de Prueba
