Name: Date: Period:! Radioactivity!Worksheet! 1. State the number of neutrons and protons in each of the following nuclei: a. 2 1H : b. 12 6C : 56 Fe : c. 26 d. 79 197 Au : 2. The three types of radioactive emissions are called alpha (α), beta (β) and gamma (γ) radiation. Complete the table below with the correct information about each type. Charge Atomic Symbol Can Be Stopped By Alpha Beta Gamma 3. Which of the three radioactive emissions (α, β, γ ) best fit the following statements? Write the correct symbol/s on the lines. a) These emissions are charged. b) This emission is the most massive (heaviest). c) This emission is the most charged. d) This emission is most dangerous outside of the body. e) This emission is stopped by thin paper or a few centimeters of air. f) This emission can travel through paper, but is stopped by aluminum. g) This emission can travel through fairly thick lead. 4. Which type of radiation alpha, beta, or gamma: a. Results in the greatest change in atomic number? Why? b. Results in the least change in atomic number? Why?
c. Produces the greatest change in mass number? Why? d. Produces the least change in mass number? Why? 5. Complete the following nuclear reactions: a. 226 88 Ra!??? + 0 1 e b. 209 84 Po! 205 82 Pb +??? c. 238 92U!??? + 4 2 He d. 234 90Th! 234 91 Pa +??? e.??? + 14 7 N! 17 8 O + 1 1 H 6. When isotope bismuth-213 emits an alpha particle: a. Write out the nuclear equation: b. What new element results if the isotope, instead, emits a beta particle? 7. When 218 84 Po emits a beta particle, it transforms into a new element. Write out the nuclear equation:
Worksheet Packet Simple Machines Identify the class of each lever shown below. Label the effort force, resistance force, and fulcrum. 1. 2. 3. 4. 5. Which of the above levers would be the most efficient at lifting a heavy block of granite? Label the type of simple machine: (lever, pulley, ramp, screw, wheel, wedge) 6. Log Splitter 10. Corkscrew 7. Zipper 11. Doorknob 8. Stapler 12. Staircase 9. Watch Gears 13. Ski Run Write WORK on the line provided if work is done, and NONE if no work is done: 14. Jeff is sitting in a gaming rocker chair reading instructions for his new system. 15. Jeff tilts the chair back while going off a jump in his Wii Game. 16. The game makes a loud crashing noise as Jeff collides with a tree. 17. The remote controller in Jeffs hands vibrates with the crashing sound.
Use the formulas below to solve the following problems: work = force x distance power = work done/time 18. How much work was done to kick a 6 N soccer ball 5 meters? Joules 19. What power was used if it took 0.5 seconds? Watts 20. Two football players each applied 100 N of force to sack the QB and move him 3 meters downfield. How much work was done? Joules 21. Mechanical advantage is the number of times the input force is (divided / multiplied) by a machine. 22. An inclined plane allows you to lift a heavy load by using ( more / less) force over a greater distance. 23. When you use a machine, the output work can never be ( greater / less) than the input work. 24. A fixed pulley changes the (distance / direction) of the force you exert.
**Write Fission or Fusion next to each of the descriptions below:** 1. Generates a large volume of solid radioactive waste. 2. Occurs in the core of the Earth. 3. The reaction occurs only at extremely high temperatures. 4. Earth s source in internal energy. (volcanoes, plate motion, geothermal, etc.) 5. The products of this reaction are not radioactive. 6. Occurs only in the core of the Sun. 7. Earth s source of external energy (atmosphere, oceans, weather, plants, etc.). 8. Also called radioactive decay. 9. Responsible for providing heat for the convection in the interior of the Earth. 10. A potential power source but we lack the technology to maintain the reactions so we are unable to perform these reactions on Earth. 11. The one with a u in it. 12. The one with two i s in it. 13. The one that sounds like fuse 14. The one that almost rhymes with split. 15. Creates enough energy for the whole Earth (inside and out) and.!
Name: Date: Half - Life Practice 1. What is meant by half-life? 2. If you have 100 grams of a radioactive isotope with a half-life of 10 years: a. How much of the isotope will you have left after 10 years? b. How much of the isotope will you have left after 20 years? c. How many half-lives will occur in 40 years? 3. The half-life of plutonium-239 is 24,300 years. If a nuclear bomb released 8 kg of this isotope, how many years would pass before the amount is reduced to 1 kg? 4. The half-life of radon-222 is 3.8 days. How much of a 100 gram sample is left after 15.2 days? 5. Carbon-14 has a half-life of 5,730 years. If a sample contained 70 mg originally, how much is left after 17,190 years? 6. The half-life of cobalt-60 is 5.26 years. If 50 grams are left after 15.78 years, how many grams were in the original sample? 7. The half-life of I-137 is 8.07 days. If 25 grams are left after 40.35 days, how many grams were in the original sample? 8. If 100 grams of Au-198 decays to 6.25 grams in 10.8 days, what is the half-life of Au-198?