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The emission of electrons from an object when electromagnetic radiation is incident upon it is known as the photoelectric effect Electrons are ejected from the object only when the frequency of the radiation is greater than a certain minimum value, called the threshold frequency In this investigation you will model the photoelectric effect using steel balls You will examine why only certain types of electromagnetic radiation result in the emission of photoelectrons

Formulate a model to investigate the photo-

Here, instead of using one of the convenient class methods on NSBezierPath to get a complete shape right away, we are using some more basic methods to construct a path out of nothing. The moveToPoint: method positions a virtual pen at the specified point, without drawing a line to it. And lineToPoint: draws a line from the path s current point to the new point. In reality, these methods don t do any drawing; they simply build up the Bezier path structure that is later drawn by the stroke method. One additional finesse here is that we set the line cap style. This setting defines what happens at the ends of lines. This is especially important for the eyes, which are drawn as a single point. Using the default setting, which lops off everything precisely where the line segment ends, the eyes were completely invisible, but using NSRoundLineCapStyle gives us a perfect tiny circle for each eye. Build & Run to see the final result (Figure 13 6).

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steel balls (3) grooved channel (U-channel or shelf bracket) books red, orange, yellow, green, blue, and violet marking pens (or colored stickers) metric ruler isopropyl alcohol

electric effect Describe how the energy of a photon is related to its frequency Use scientific explanations to explain why macroscopic phenomena cannot explain the quantum behavior of the atom

1 Shape the grooved channel, as shown in the photo, and use several books to support the channel, as shown Make sure the books do not block the ends of the channel 2 Mark a capital letter R with a red marking pen on the channel 4 cm above the table, as shown The R represents red 3 Mark a capital letter V with a violet marking pen on the channel at a distance 14 cm above the table as shown The V represents violet Use the other colored pens to place marks for blue, B, green, G, yellow, Y, and orange, O, uniformly between the marks for R and V 4 Place two steel balls at the lowest point on the channel These steel balls represent the atom s valence electrons 5 Hold a steel ball in place on the channel at the R position This steel ball represents an incident photon of red light Note that the red photon has the lowest energy of the six colors of light being modeled 6 Release the steel ball (photon) and see if it has enough energy to remove a valence electron from the atom; that is, observe if either of the two steel ball electrons escapes from the channel Record your observations in the data table

Color or Energy of Photon Red Orange Yellow Green Blue Violet Less than red Greater than violet Observations

7 Remove the steel ball that represents the incident photon from the lower part of the channel Replace the two steel balls used to represent the valence electrons at the lowest point on the channel 8 Repeat steps 5 7 for each of the colors you marked on the channel Be sure always to start with the two steel balls at the lowest point on the channel Note that the violet photon has the greatest energy of the six colors of light being modeled Record your observations in the data table 9 Repeat steps 5 7, but release the steel ball representing the incident photon from a point slightly lower than the R position Record your observations in the data table 10 Repeat steps 5 7, but release the steel ball representing the incident photon from a point slightly higher than the V position Record your observations in the data table 11 Answer question 1 in the Conclude and Apply section and then test your prediction 12 When you have finished the lab, return all materials to the locations specified by your instructor Clean off the ink markings on the channel with isopropyl alcohol (or remove the colored stickers placed on the channel)

5:

Figure 13 6. Mr Smiley. He really is happy, I m sure of it!

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