PHYS320 lab10_Plancks_DATA_SHEETwhz

# PHYS320 lab10_Plancks_DATA_SHEETwhz - Physics 320...

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Physics 320 Experiment 10 Measurement of Planck’s Constant with LEDs DATA SHEET Name: Bill Zacharias Date: 6/10/2010 Data 1. Record the voltage offsets from the measurement on each LED in the table below. 2. Calculate a value for Planck’s constant for each measurement and find an average. color wavelength λ (nm) Y offset (V) h ( × 10 - 34 J s) red 624 1.63 5.42 orange 602 2.03 6.52 yellow 591 2.1 6.62 green 525 1.9 5.32 blue 470 2.48 6.22 average 6.02 3. Compare the average of your measurements with the accepted value and calculate a percent difference. The percent difference is ___9.6%_____ 4. Paste a copy of your capacitor voltage versus time graph here. Phys320 Lab Page 1 Experiment 10

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Physics 320 Experiment10 continued 1.63volts 2.03 volts Phys320 Lab Page 2 Experiment 10
Physics 320 Experiment10 continued 1.90volts Phys320 Lab Page 3 Experiment 10

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Physics 320 Experiment10 continued 2.10 Questions 5. Explain why an LED’s brightness is proportional to the electric current flowing through it. LED
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PHYS320 lab10_Plancks_DATA_SHEETwhz - Physics 320...

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