1. Which subatomic particle has the smallest mass?(1 point) Responses proton proton neutron neutron electron electron quark quark Question 2 2. Why are all atoms in their natural state electrically neutral?(1 point) Responses atoms are only composed of neutrons atoms are only composed of neutrons the number of electrons and neutrons are equal the number of electrons and neutrons are equal the number of electrons and protons are equal the number of electrons and protons are equal the number of protons and neutrons are equal the number of protons and neutrons are equal Question 3 3. The atomic number on the periodic table refers to the number of _____ within an atom.(1 point) Responses protons or electrons protons or electrons neutrons and protons neutrons and protons nuclei nuclei quarks quarks Question 4 4. Which statement is correct about the half-lives of radioactive elements?(1 point) Responses The half-lives of radioactive elements vary within a similar range of a few seconds. The half-lives of radioactive elements vary within a similar range of a few seconds. The half-lives of radioactive elements with more neutrons become larger. The half-lives of radioactive elements with more neutrons become larger. The half-lives of radioactive elements with more neutrons become smaller. The half-lives of radioactive elements with more neutrons become smaller. The half-lives of radioactive elements vary from fractions of a second to billions of years. The half-lives of radioactive elements vary from fractions of a second to billions of years. Question 5 5. Nuclide X decays more quickly than nuclide Y. Based on this information, which of the following statements must be true?(1 point) Responses Nuclide Y is less abundant than nuclide X Nuclide Y is less abundant than nuclide X Nuclide Y has a larger half-life than nuclide X Nuclide Y has a larger half-life than nuclide X Nuclide Y has a shorter half-life than nuclide X Nuclide Y has a shorter half-life than nuclide X The daughter nuclides of X are more abundant than those of Y The daughter nuclides of X are more abundant than those of Y Question 6 6. What type of decay is shown above? (1 point) Responses alpha decay alpha decay gamma decay gamma decay beta decay beta decay fusion decay fusion decay Question 7 7. In what way does a lead apron protect human cells from X-rays?(1 point) Responses It reduces the X-ray strength. It reduces the X-ray strength. The lead apron shields cells from exposure. The lead apron shields cells from exposure. The person is less likely to move. The person is less likely to move. It keeps the X-rays away from the mouth. It keeps the X-rays away from the mouth. Question 8 8. Why are children more susceptible to the effects of ionizing radiation?(1 point) Responses They have many growing cells that can easily have DNA damaged. They have many growing cells that can easily have DNA damaged. They move around a lot and pick up radiation. They move around a lot and pick up radiation. They do not know how to prevent exposure to radiation. They do not know how to prevent exposure to radiation. They get sick easily. They get sick easily. Question 9 9. What determines the severity of the effects of radiation on the human body?(1 point) Responses time and amount of exposure time and amount of exposure time of exposure only time of exposure only amount of exposure only amount of exposure only source of radiation source of radiation Question 10 10. Which of the following gives good evidence for the wave nature of EM radiation?(1 point) Responses matter waves matter waves interference patterns interference patterns existence of photons existence of photons the photoelectric effect the photoelectric effect
1. electron
2. the number of electrons and protons are equal
3. protons or electrons
4. The half-lives of radioactive elements vary from fractions of a second to billions of years.
5. Nuclide Y has a shorter half-life than nuclide X
6. beta decay
7. The lead apron shields cells from exposure.
8. They have many growing cells that can easily have DNA damaged.
9. time and amount of exposure
10. interference patterns