Planck Constant Lab 2

# Planck Constant Lab 2 - Plancks Constant Experiment 2 PEP...

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Planck’s Constant - Experiment 2 PEP 201-LA March 2, 2011 I pledge my honor that I have abided by the Stevens Honor System. Introduction Planck’s Constant is explored throughout this lab.The purpose of this lab is to get an estimate of Planck’s constant using Light Emitting Diodes (LEDs). The apparatus used consists of a panel mounted on a rod which contains six LED lights. In this lab, Planck’s constant is solved by measuring E and . Planck’s constant relates the energy with the equation E = ƛ hf. In this experiment, the current required to illuminate the various LED lights will be determined by using the equation I R = V R /100. The equation f=c/ was used to find the frequency, c being the ƛ speed of light equal to 3*10^8. Knowing that the h theoretical is 6.626068*10^-32 and e= 1.6*10^-19c then with the equation h=V D e/f we were able to determine the calculated planks

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Unformatted text preview: constant. The data of V is graphed against 1/ . The slope of the line is determined and then set ƛ equal to hc/e and Planck’s constant is later solved for. Data (Table 1) V-1 Curves: Data (Table 2): Vd-f Graph: Conclusion and Discussion: As we read in the experiment manual, “the diode’s characteristic curve is displayed on an oscilloscope, a ‘knee’ in the curve is seen clearly.” Graphs for each diode were made, and the “knee” is visible at the beginning of each graph. The lab verified the existence of Planck’s Constant and confirmed the relationship between voltage, frequency, the speed of light, and Planck’s Constant. The calculations for the 920 nm LED were much skewed so we decided to exclude that data from the rest. This was due to having a bad LED which changed our calculated values....
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• Spring '12
• Corn
• Planck, Light-emitting diode, Stevens Honor System, 920 nm

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