Calculating Planck's constant from LED experiment.

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SUMMARY

The forum discussion focuses on calculating Planck's constant using an LED experiment. The key equation involved is E = hν, where E represents energy, h is Planck's constant, and ν is the frequency of light emitted by the LED. Participants emphasized the importance of understanding the LED's power output and its efficiency in converting electrical energy to light, as indicated in the LED's datasheet. A non-linear I-V curve for the LED was also noted, particularly at low bias voltages.

PREREQUISITES
  • Understanding of the equation E = hν
  • Familiarity with LED characteristics and datasheets
  • Knowledge of I-V curve analysis
  • Basic principles of energy conversion in electronic components
NEXT STEPS
  • Research the efficiency of different LED types in converting electrical power to light
  • Learn about non-linear I-V curve behavior in semiconductor devices
  • Explore methods for measuring light output from LEDs
  • Study the implications of Planck's constant in quantum mechanics
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Physics students, electrical engineers, and researchers interested in experimental physics and quantum mechanics, particularly those conducting experiments related to Planck's constant and LED technology.

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edit: problem solved. Thankyou berkeman.
 
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The I V curve of that circuit should not be linear, at least not for the first few volts of bias.

You will have to make some assumptions, but if you know the power of the light that comes out of the LED, you can work back to h.

http://en.wikipedia.org/wiki/Planc's_constant

Do you have some ideas about how you can use this equation?

E = h \nu

I'm not sure what you should do about the assumption of how much of the power delivered to the LED (excluding the external dropping resistor of course) is converted to light, versus heat. Do you have the datasheet for the LED? That may give you that part of the calculation.
 

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