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Question How is the force exerted by double-sided tape similar to the strong force Procedure 1 Cover the outer edges of 3 6 disk magnets with double-sided tape Do the same thing to 3 6 disks of wood or aluminum of the same size The magnets represent protons The other disks represent neutrons 2 Arrange the magnets with all the north poles facing up 3 Describe the force exerted on one proton when another proton is brought closer, until they finally touch 4 Describe the force exerted on a neutron by either another neutron or a proton when they are brought together, until they finally touch Analysis The strong force drops to zero when the centers of two nucleons are farther apart than their diameters How does that compare with the range of the force of the tape The strong force is the same for neutrons and protons Does this model behave this way Critical Thinking Stable nuclei usually have more neutrons than protons Why would this model behave the same way

rnest Rutherford not only established the existence of the nucleus, but he also conducted some of the early experiments to discover its structure It is important to realize that neither Rutherford s experiments, nor the experiments of those who followed, offered the opportunity to observe the atom directly Instead, inferences were drawn from the observations that researchers made Recall from 28 that Rutherford s team made careful measurements of the deflection of alpha particles as they hit gold foil These deflections could be explained if the atom was mostly empty space The experiment showed that the atom had a small, dense, positively charged center surrounded by nearly massless electrons After the discovery of radioactivity by Becquerel in 1896, he and others looked at the effects produced when a nucleus breaks apart in natural radioactive decay Marie and Pierre Curie discovered the new element radium and made it available to researchers all over the world, thereby increasing the study of radioactivity Scientists discovered that through radioactivity one kind of atom could change into another kind, and thus, atoms must be made up of smaller parts Ernest Rutherford and Fredrick Soddy used radioactivity to probe the center of the atom, the nucleus

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Determine the number of neutrons and protons in nuclides Define the binding energy of the nucleus Relate the energy released in a nuclear reaction to the change in binding energy during the reaction

atomic number atomic mass unit mass number nuclide strong nuclear force nucleons binding energy mass defect

Are nuclei made up only of positively charged particles At first, only the mass of the nucleus and the fact that the charge was positive were known The magnitude of the charge of the nucleus was found as a result of X-ray scattering experiments done by Henry Moseley, a member of Rutherford s team The results showed that the positively charged protons accounted for roughly half the mass of the nucleus One hypothesis was that the extra mass was the result of protons, and that electrons in the nucleus reduced the charge to the observed value This hypothesis, however, had some fundamental problems In 1932, English physicist James Chadwick solved the problem when he discovered a neutral particle that had a mass approximately that of the proton This particle, known as the neutron, accounted for the missing mass of the nucleus without increasing its charge Mass and charge of the nucleus The only charged particle in the nucleus is the proton The atomic number, Z, of an atom is the number of protons The total charge of the nucleus is the number of protons times the elementary charge, e nuclear charge Ze

From a technical standpoint, the basic unit at the heart of all this is a class called CALayer (a pre-release version of Core Animation was even called Layer Kit). Each NSView can optionally have a CALayer attached to it, either by flicking a switch in Interface Builder or setting it up in code. The process of assigning a layer to a view actually begins a recursive process through all the view s subviews, so that when a view has a layer, all its subviews (and all their subviews, and so on) also acquire layers. Once a layer is in place, you can start animating the view. Under the hood, each CALayer is associated with some OpenGL structures for rendering its graphics. OpenGL does a really great job of quickly drawing rectangles to the screen, even rectangles that are resized, rotated, and the like, so using CALayer lets you have views that do all sorts of on-screen tricks without slowing your application down. The Core Animation APIs shield you completely from OpenGL itself, so it will work away quietly without you having to think about it too much. The only thing to bear in mind is that each layer uses some amount of the memory available to the computer s graphics hardware, so you re better off using layers only for those parts of your application where you actually want to do some animation, instead of applying them to every view in every window.

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