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Turn on a gas-discharge tube power supply attached to a gas tube so that the tube glows CAUTION: Handle gas tube carefully to avoid breaking Do not touch any exposed metal when the power supply is turned on Dangerous voltages are present Always turn off the power supply before changing gas tubes Turn off the room lights 1 Describe the color that you observe 2 Observe the gas-discharge tube through a diffraction grating 3 Sketch the results of viewing the gas-discharge tube through the diffraction grating 4 Predict whether the observed spectrum will change when a different gas-discharge tube is viewed through the diffraction grating 5 Test your prediction Analyze and Conclude 6 Sketch the results of viewing the new gas-discharge tube through the diffraction grating 7 Explain why there are differences in the two spectra

You can calculate the radius of the innermost orbit of a hydrogen atom, also known as the Bohr radius, by substituting known values and n 1 into the above equation r1

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This window will let the user drag in an image (to the drag well) and type in a message that will be displayed over the image. The LOLView will notice the dragged-in image and edited text, and trigger a redisplay of itself, through the use of Cocoa Bindings. The first half of the bindings will be configured in Interface Builder, the second half in code. First, select the image well and switch to the Bindings Inspector. Create a binding for the Value attribute, selecting the app delegate in the popup list and typing image into the Model Key Path field. Then select the text field, and create a binding for its Value attribute, again selecting the app delegate in the popup list and this time typing text into the Model Key Path field. That takes care of the bindings for the controls, but because Interface Builder doesn t know about LOLView and what its bind-able values are, we have to set up its bindings in code. Go back to Xcode, and edit LOLmaker_AppDelegate.m, adding the following method to the @implementation section:

(6626 10 4

2(90 34

J s)2(1)2

5:

m2/C2)(911

kg)(160 10

53 10 53 10

- (void)applicationDidFinishLaunching:(NSNotification *)aNotification { [lolView bind:@"image" toObject:self withKeyPath:@"image" options:nil]; [lolView bind:@"text" toObject:self withKeyPath:@"text" options:nil]; }

By performing a little more algebra you can show that the total energy of the atom, which is the sum of the kinetic energy of the electron and the potential energy, and is given by Kq2/2r, is represented by the following equation: En

By substituting numerical values for the constants, you can calculate the total energy of the atom in joules, which yields the following equation: En 217 10

1 n2

Converting the relationship to units of electron volts yields the following equation Energy of a Hydrogen Atom En 136 eV

1 n2

That takes care of the basic communications between all the objects in this application. User edits to the controls in the window are passed along to the app delegate, and from there they ll be passed along to the LOLView, all through Cocoa Bindings. The plumbing of our app is now complete!

The total energy of an atom with principal quantum number n is equal to the product of 136 eV and the inverse of n 2

Both the electron s orbital radius and the energy of the atom are quantized The integer, n, that appears in these equations is called the principal quantum number It is the principal quantum number that determines the quantized values of r and E In summary, the radius, r, increases as the square of n, whereas the energy, E, depends on 1/n2

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