4. Two deuterium (H) nuclei are travelling directly towards one another. When the separation is large compared with their diameters, they each have speed y as illustrated in Fig. 4.1. V. deuterium nucleus deuterium nucleus Fig. 4.1 The diameter of a deuterium nucleus is 1.1 x 10-14 m. (a) Use energy considerations to show that the initial speed v of the deuterium nucei must be approximately 2.5 x 106 m s-1 in order that they may come into contact Explain your working.

10. Which of the following statements are true from Figure 4? I. This is a PWR reactor. II. The primary working fluid cannot be converted into steam due to high pressure. III. The reactor can use water to absorb neutrons. a. Only I b. I and II c. d. e. II and III I, II, and III None of the above Steam- Which of the previous statements are TRUE? a. Only I b. I and II c. I and III d. II, III, and IV e. I, III, and IV Core H₂O Reactor vessel P1000 psi T-540 F Feedwater Figure 4 Condenser Pump S 1000 L Turbine Generator Water 11. During the magnetic confinement method to produce fusion... I. A plasma is produced by using high temperatures inside a toroidal-shaped container. II. D-T fuel pellets are heated with a pulsed laser. III. Strong magnetic fields make charged particles to move in a corkscrew-type path. IV. High temperature is needed to increase the kinetic energy. Cold H₂O Hot H₂O Electricity Lake or cooling tower

6. In nature, in a stable state hydrogen has two kinds of isotopes, namely 99.985% 1H with an atomic mass of 1.00783 sma and 0.015% 2H with an atomic mass of 2.01410 sma.  The average atomic mass of hydrogen is .... (in sma)  a. 1.00150  b. 1.00324  c. 1.00798 d.  1.01528  e.  1.07960 Note : all H have the number 1 below 1H

Part A Some atomic masses Particle Symbol Mass (u) Electron e 0.00055 Part B Proton 1.00728 Neutron 1.00866 Part C Hydrogen 1.00783 Helium 4He 4.00260 Part D Part E Part F Calculate the binding energy per nucleon of the helium nucleus He. Express your answer in megaelectron volts to two significant figures. ? MeV