Photoelectric Effect Calculator

Find the maximum kinetic energy of ejected photoelectrons.

Max kinetic energy (eV) 0.7996

Photon energy (eV) 3.1

Formula: KE_max = h·f − φ

Step-by-step with your numbers:

1. Values used:

2. Light wavelength = 400 nm

3. Work function = 2.3 eV

5. Max kinetic energy = 0.7996eV

6. Photon energy = 3.1eV

Did we solve your problem today?

Light ejects electrons from a metal only if each photon carries more energy than the work function.

The math behind it

KE_max = h·f − φ. A negative result means no electrons are emitted at that wavelength.

400 nm light (3.1 eV) on a 2.3 eV metal → 0.8 eV.

Why doesn't brighter dim light help?

Energy depends on frequency per photon, not intensity.