µ IB |Nuclear Reactions

10 quick questions



10 minutes maximum!

(Can you do it in 5?)



1.Which of the following answers best describes fusion and fission?

Fusion Fission
The joining together of heavy nuclei The splitting of light nuclei
The splitting of light nuclei The joining together of heavy nuclei
The joining together of light nuclei The splitting of heavy nuclei
The splitting of heavy nuclei The joining together of light nuclei

2. In the physics data book, the constant 'u' is given a value of 931.5 MeV c-2. This is a unit of...

  • A. energy.
  • B. momentum.
  • C. mass.
  • D. velocity.
3. Which of these statments gives the definition of 'binding energy'?
  • A. The energy required to completely separate the nucleons.
  • B. The energy required to split the nucleus in two.
  • C. The energy required to convert all of the mass present into energy.
  • D. The energy required to fuse two identical nuclei together.

4. Which of the following 4 metals has the highest binding energy per nucleon?

  • A. Aluminium
  • B. Lithium
  • C. Uranium
  • D. Iron

5. To calculate the energy released in fission and fusion, we use the formula:

ΔE = Δm c2

What does the letter 'c' represent in this formula?

  • A. Charge of nucleus
  • B. Specific heat capacity of the element
  • C. Speed of light
  • D. Binding energy

6. Complete the following sentence:


A carbon-12 nucleus has a(n) mass compared to the total mass of the separated individual nucleons.

7. Binding energy per nucleon varies with atomic mass and can be compared on a graph as shown below. Which of the graphs below gives the approximate shape of the best fit line of this graph?


7. Binding energy graph x4

8-10. These questions are about this element lithium. The symbol is shown here :

7 Li

Pieces of Lithium metal from the Dennis s.k collection - Wikimedia

8. What are the values of N, Z and A for this stable isotope of lithium?

  • A. A = 4, N = 7, Z = 3.
  • B. A = 3, N = 7, Z = 4.
  • C. A = 7, N = 4, Z = 3.
  • D. A = 7, N = 3, Z = 4.

9. To the nearest whole number, the binding energy per nucleon of lithium-7 is 6 MeV.

What is the total mass defect of a lithium-7 nuclei using the value given above?

  • A. 24 MeV c-2
  • B. 18 MeV c-2
  • C. 42 MeV c-2
  • D. 6 MeV c-2

10. If two lithium-7 nuclei fuse together, they would produce an isotope of carbon called carbon-14. The binding energy per nucleon for carbon-14 is 8 MeV, to the nearest whole number.

Using the rounded (whole number) data given, what energy is released if two lithium-7 nuclei fused to produce a carbon-14 nucleus?

14 C
  • A. 28 MeV
  • B. 24 MeV
  • C. 42 MeV
  • D. 70 MeV