Enter incident light frequency (or wavelength) and metal work function; compute the maximum photoelectron kinetic energy via Einstein's equation, judge whether emission occurs and give the cutoff frequency, for photocell and PV principle demos.
光电子最大初动能等于光子能量减功函数。
| Item | Formula / Note | Source / Standard |
|---|---|---|
| Einstein equation | K_max = hν − W | Einstein 1905 |
| Work function | W is material property | Photoelectric theory |
| Threshold frequency | ν₀ = W/h | Photoelectric threshold |
| Stopping potential | eV_s = K_max | Experimental method |
| Intensity relation | Intensity sets current not energy | Experimental laws |
| Planck constant | h = 6.626×10⁻³⁴ J·s | CODATA 2018 |