Planck's Constant Activity

Objective

The objective of this experiment was to determine the value of planck's constant using the wavelength and voltage readings on LED lights.

blue LED:

Vo = 2.76 V
E = 4.42*10^-19 J
lambda = 450 nm

h = E*lambda/c = 6.62*10^-34

Yellow LED:

Vo = 1.95 V

E = 3.12*10^-19 J

lambda = 590 nm

h = 6.14*10^-34

Both of the experimental values of planck's constant agree with the theoretical value within 10% uncertainty.