1.Which of the following answers best describes the strong nuclear force in the atom?

2. Which of these statements gives the best definition of the 'binding energy' of a nucleus?

• 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.

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

4. The constant 'u' has a value of 931.5 MeV c^-2. This unit MeV c^-2 is a unit of...

• A. energy.
• B. momentum
• C. mass
• D. velocity

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:

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?

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

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

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. 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 fuse to produce a carbon-14 nucleus?

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