Instructions: Read each scenario carefully and answer the computational questions.

Q1. The average U.S. household uses 886 kWh of electricity per month. Use the following conversions to calculate the pounds of coal that would be burned to generate electricity for the household for one year.

Q2. Calculate the pounds of uranium that would undergo fission to generate electricity for the same household for one year.








Q3. As mentioned in the Science of Nuclear video, varying fuels have varying energy densities, with uranium having an extremely high energy density of 80,000,000 MJ/kg. Coal and natural gas have average energy densities of 16 MJ/kg and 15 MJ/kg, respectively. Calculate the percent difference between the energy densities of uranium and natural gas.

Q4. Calculate the percent difference between the energy densities of coal and natural gas.

Q5. How much Carbon-14 remains after 17,190 years if you start with 80 grams? (Carbon-14 has a half-life of 5,730 years.)

1. 40 grams
2. 20 grams
3. 10 grams
4. 5 grams

Q6. You start with 160 grams of Iodine-131. After 16 days, only 40 grams remain. What is the half-life of Iodine-131? 

1. 2 days
2. 4 days
3. 8 days
4. 16 days

Q7. A 10-gram sample of Cesium-137 has decayed to 1.25 grams. How many half-lives have passed? (Cesium-137 has a half-life of about 30 years.)

1. 2
2. 3
3. 4
4. 5

Q8. If Uranium-238 has a half-life of 4.5 billion years, how much would remain from a 64-gram sample after 13.5 billion years? 

1. 32 grams
2. 16 grams
3. 8 grams
4. 4 grams