Determining Planck's Constant from Photoelectric Effect
This simulation demonstrates how Planck's constant can be determined from the slope of the cut-off voltage versus frequency graph in the photoelectric effect experiment.
V·s
Range: 3.50 - 4.50 ×10⁻¹⁵
Current: 4.12 ×10⁻¹⁵
Coulombs (C)
Range: 1.500 - 1.700 ×10⁻¹⁹
Current: 1.600 ×10⁻¹⁹
Calculation Results
h = e × (ΔV/Δν)
Where h is Planck's constant, e is the electron charge (1.602 × 10⁻¹⁹ C), and ΔV/Δν is the slope of the cut-off voltage versus frequency graph.
Experimental Slope (ΔV/Δν):
4.12 ×10⁻¹⁵ V·s
Electron Charge (e):
1.600 ×10⁻¹⁹ C
Calculated Planck's Constant (h):
6.592 ×10⁻³⁴ J·s
Actual Planck's Constant:
6.626 ×10⁻³⁴ J·s
Percentage Error:
0.51%
