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You will need 50 pennies to represent 50 atoms of a radioactive isotope In this simulation, heads indicates that a nucleus has not decayed 1 Record 50 heads as the starting point 2 Shake all the pennies in a large cup and pour them out Remove all the tails and set them aside Count and record the number of heads 3 Repeat step 2 with the pennies that were heads in the last throw Each throw simulates one half-life Analyze and Conclude 4 Graph the number of pennies as a function of the number of half-lives 5 Collect the results from other students and use the totals to make a new graph 6 Compare this graph with the individual ones Which more closely matches the theoretical graph in Figure 30-4

In nuclear fusion, nuclei with small masses combine to form a nucleus with a larger mass, as shown in Figure 30-9 on the next page In the process, energy is released You learned earlier in this chapter that the larger nucleus is more tightly bound, so its mass is less than the sum of the masses of the smaller nuclei This loss of mass corresponds to a release of energy

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Actions are Objective-C methods that can be invoked directly from your application s user interface. They are methods just like any other Objective-C methods you ve written, but they get executed when a user interface item is utilized. If you link a button to an action method, for example, the code in your action method will fire any time that button is clicked. If you link a text field to an action, its action method will fire any time the user tabs out of that text field or otherwise moves to another control. Exactly what will cause the method to fire depends on the type of object that is linked to it and, sometimes, how the attributes of that object are set. A slider, for example, may cause your action method to fire once after the user releases the mouse button, or it may repeatedly cause your method to fire as the slider is used, depending on how you set up the slider instance in Interface Builder. Actions are created exactly the way other Objective-C methods are, except that they must be declared using a special return type: IBAction. Actions must take a single argument (typically declared as type id). This argument is used to tell the method which interface item is calling it. Action method declarations have to look like this:

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Figure 30-9 The fusion of deuterium and tritium produces helium Protons are red and neutrons are gray in the figure

An example of fusion is the process that occurs in the Sun Four hydrogen nuclei (protons) fuse in several steps to form one helium nucleus The mass of the four protons is greater than the mass of the helium nucleus that is produced The energy equivalent of this mass 1n 0 difference appears as the kinetic energy of the resultant particles The energy released by the fusion that produces one helium-4 nucleus is 25 MeV In comparison, the energy released when one dynamite molecule reacts chemically is about 20 eV, about 1 million times smaller There are several processes by which fusion occurs in the Sun The most important process is the proton-proton chain

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The first two reactions must occur twice to produce the two 3He particles 2 needed for the final reaction The net result (subtracting out the two protons produced in the final step) is that four protons produce one 4He, two 2 positrons, and two neutrinos The repulsive force between the charged nuclei requires the fusing nuclei to have high energies Thus, fusion reactions take place only when the nuclei have large amounts of thermal energy The proton-proton chain requires a temperature of about 2 107 K, such as that found in the center of the Sun Fusion reactions also occur in a hydrogen, or thermonuclear, bomb In this device, the high temperature necessary to produce the fusion reaction is produced by exploding a uranium fission, or atomic, bomb

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