Fission, fusion and how radiation is used

Answer Key - Grade 10 Science Worksheet - Challenge Me

Circle the best answer, or write your answer on the line.

1. 1.

   Fission of uranium-235 gives about 2500000 times the energy of the same mass of coal. How many kilograms of coal match 2 kg of uranium-235, Ari?

   5,000,000 kg
2. 2.

   Fission of uranium-235 gives about 2500000 times the energy of the same mass of coal. How many kilograms of coal match 0.5 kg of uranium-235, Bo?

   1,250,000 kg
3. 3.

   Fission of uranium-235 gives about 2500000 times the energy of the same mass of coal. How many kilograms of coal match 3 kg of uranium-235, Esme?

   7,500,000 kg
4. 4.

   What is the Sun's main nuclear fuel, Kira?

   • Uranium
   • Coal
   • Hydrogen
5. 5.

   What charge does a positron carry, Luz?

   • +1
   • 0
   • −1
6. 6.

   Milo says the Sun shines by splitting heavy atoms. Agree or disagree?

   • Agree: the Sun splits heavy atoms like a reactor
   • Agree: the Sun burns coal
   • Disagree: it fuses hydrogen into helium
7. 7.

   Noah says nuclear power plants make energy by joining hydrogen nuclei. Agree or disagree?

   • Agree: plants join light nuclei like the Sun
   • Disagree: they split uranium-235
   • Agree: plants burn hydrogen gas
8. 8.

   Which isotope or process fits dating a wooden bowl, Ren?

   • Hydrogen fusion
   • Carbon-14
   • Uranium-235 fission
9. 9.

   Which isotope fits a short-lived tracer for medical scans, Tala?

   • Technetium-99m
   • Uranium-235
   • Carbon-14
10. 10.

    Which isotope or process fits making electricity in a power plant, Zee?

    • Uranium-235 fission
    • Carbon-14 dating
    • Technetium-99m tracers