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## Homework Statement

Data obtained in a photoelectric experiment:

Wavelength (nm): 140, 117, 93.3, 70.0

Maximum Kinetic Energy of Photoelectrons (eV): 2.76, 4.50, 7.19, 11.61

From the graph, determine an experimental value for Planck's constant (in joules-seconds).

## Homework Equations

Frequency (c/wavelength): 21.43E14, 25.64E14, 32.15E14, 42.85E14

Maximum Kinetic Energy of Photoelectrons (eV): 2.76, 4.50, 7.19, 11.61

Conversion factor: 1.6E-19 J / 1 eV

## The Attempt at a Solution

Plotting Kmax (y-axis) and Frequency (x-axis), generates the

equation: y = 0.4132x - 6.0936

h(Planck's constant) = slope * conversion factor * 1 / 10E14 (frequency factor)

Experimental h value is: 6.6E-34, which is incorrect!

Please help me find the experimental value of Planck's constant. Thank you!