ssrs code 39

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According to the Bohr model, the radius of an electron s orbit can have only certain (quantized) values The radius of the electron in energy level n of a hydrogen atom is given by the following equation rn

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In the quantum-mechanical model of the atom, the atom s energy has only specific, quantized values In the quantum-mechanical model of the atom, only the probability of finding the electron in a specific region can be determined In the hydrogen atom, the most probable distance of the electron from the nucleus is the same as the electron s orbital radius in the Bohr model Quantum mechanics is extremely successful in calculating the properties of atoms, molecules, and solids Lasers produce light that is directional, powerful, monochromatic, and coherent Each property gives the laser useful applications

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- (void)drawRect:(NSRect)rect { // Drawing code here. NSRect srcImageRect = NSMakeRect(0, 0, [self.image size].width, [self.image size].height); [self.image drawAtPoint:[self bounds].origin fromRect:srcImageRect operation:NSCompositeCopy fraction:1.0]; if (text != nil && [text length] > 0) { NSPoint textLocation = NSMakePoint(0,0); NSShadow *textShadow = [[NSShadow alloc] init]; [textShadow setShadowOffset:NSMakeSize(0,0)]; [textShadow setShadowColor:[NSColor blackColor]]; [textShadow setShadowBlurRadius:10]; NSMutableDictionary *textAttributes = [NSMutableDictionary dictionaryWithObjectsAndKeys: [NSFont fontWithName:@"Impact" size:40], NSFontAttributeName, [NSColor whiteColor], NSForegroundColorAttributeName, textShadow, NSShadowAttributeName, nil]; // find the optimal size CGFloat fontSize; NSSize testSize = NSMakeSize(0, 0); for(fontSize=1; testSize.width < [image size].width; fontSize*=2) { [textAttributes setObject:[NSFont fontWithName:@"Impact" size:fontSize] forKey:NSFontAttributeName]; testSize = [self.text sizeWithAttributes:textAttributes]; } [textAttributes setObject:[NSFont fontWithName:@"Impact" size:fontSize/4] forKey:NSFontAttributeName]; [self.text drawAtPoint:textLocation withAttributes:textAttributes]; } }

terms: energy levels, fixed electron radii, Bohr model, photon emission and absorption, energy-level difference

high-energy particles from the Sun striking atoms high in Earth s atmosphere If you looked at these lights through a spectrometer, would you see a continuous or line spectrum Explain

positive charge in an atom is concentrated in a tiny region, rather than spread throughout the atom (281)

absorption spectrum of hydrogen contains exactly the same frequencies as its emission spectrum (281)

some of the problems with a planetary model of the atom (281)

E4 ( 495) E3 ( 552) E2 ( 574)

Now, Build & Run, drag in an image, and write some text. Voila! You should see something like Figure 13 13.

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What three assumptions did Bohr make in developing his model (281)

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000 Figure 28-21

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from gas-discharge tubes are produced (281)

Most applications that let you do anything interesting on the screen will also let you print your work. On Mac OS X, this is incredibly easy for a developer to implement, thanks in large part to the way that the OS s display system is designed. The Core Graphics methods and functions that we use to draw into a view can actually be used to draw into a variety of contexts, which means that the system can use our existing drawRect: methods to make us draw our content into a context that s ready for printing. The most basic way to print your content is through the use of the print: method, which is implemented both by NSWindow and NSView. You could, for instance, connect a menu item to the print: method on the First Responder object in Interface Builder. That way, whatever object the user selects will be printed if the menu item is selected. That actually points out the downside of that approach, though: because the method is called on the first responder, invoking the print command would cause the text field to be printed if the user is currently editing in a text field! Normally, you re probably better off routing your printing through a controller object instead. Presumably, either the window controller, or the document in a document-based application, knows what s the most appropriate thing to print at any point, typically either the entire window, or a single view that is the focus of the window. Using our latest example, the LOLview is what should really be printed, and we ll add a method to MyDocument to make this work. Start off by adding the following to the MyDocument class:

emitted by atoms (281)

30 Explain why line spectra produced by hydrogen gasdischarge tubes are different from those produced by helium gas-discharge tubes (281)

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