Frequently Asked Questions
Why does brightness not affect electron energy?
Brightness changes how many photons arrive, not how much energy each carries. Electron energy depends on the photon energy, set by wavelength, minus the work function.
What does no emission mean?
If the photon energy is below the work function, no electrons escape no matter how bright the light, so the calculator reports no emission and a stopping voltage of zero.
What is the stopping voltage?
It is the reverse voltage needed to halt the fastest emitted electrons. Numerically it equals the maximum kinetic energy expressed in volts, so a K_max of 1.10 eV gives a stopping voltage of 1.10 V.
What is the threshold wavelength or threshold frequency?
It is the cutoff where the photon energy exactly equals the work function, so K<sub>max</sub> = 0. Threshold frequency ν<sub>0</sub> = φ / h, and threshold wavelength λ<sub>0</sub> = hc / φ = 1239.84 / φ(eV) in nanometers. Light with a longer wavelength (lower frequency) than this ejects no electrons no matter how bright it is. For φ = 2.0 eV, λ<sub>0</sub> = 1239.84 / 2.0 ≈ 620 nm.
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Estimates for informational purposes only.
Important Disclaimer: Estimates for informational purposes only.
This calculator provides estimates for informational purposes only. Results are based on assumptions and may not reflect actual outcomes. Consult qualified professionals in relevant fields before making important decisions based on these results.