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Phys Lab9

# Phys Lab9 - colored light bulb in the LED box and took...

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Physics 263 – Section 201 Photoelectric Effect Mohand Shalaby – G00572364 Partners: Kelvin DeSilva, Aung Naing Oo . Instructor: R. W. Ellsworth Experiment done on: 12 th of April 2010

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Physics 263 Mohand Shalaby Experiment – 9 Photoelectric Effect 1. Introduction: In this experiment we are going to look at the effect of shining light on a metal plate to excite electrons in the metal. We will be using four different lights for this experiment (red, yellow, green and blue). The equation for light energy is: E = h* f; where h is Planck’s constant: 6.63*10 -34 joule- seconds The minimum stopping voltage is: e V o = h f - W 2. Apparatus: For this experiment we used the apparatus shown in Fig1:
Fig1: the apparatus setup used in this experiment. 3. Procedure: For this experiment, we setup the apparatus shown in the previous page. We inserted a

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Unformatted text preview: colored light bulb in the LED box and took measurements of V and I and represented that on a graph. We did this for the four lights we have and found V o for each case and plotted these values against the respective frequencies. 4. Data And Analysis: The V-I graphs of the different light bulbs were all in the form of decaying exponentials. The plotted graph of V o vs f : 5. Discussion: In this experiment, we are showing that when a light is shinned on a metal, the electrons of that metal get excited. We also showed that for different light, depending on their frequency, excited electrons leave the metal depending on the amount of energy that they have....
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