How to Calculate Photoelectric
What is Photoelectric?
Photoelectric effect is the emission of electrons when light hits a material. It demonstrates light's particle nature and is used in photodiodes and image sensors.
Formula
The calculator applies KE_max = hf - φ
Step-by-Step Guide
- 1Enter photon frequency and material's work function
- 2The calculator applies KE_max = hf - φ
- 3Results show maximum electron kinetic energy
Worked Examples
Input
f = 6 × 10¹⁴ Hz, φ = 2 eV
Result
KE_max = 2.48 - 2 = 0.48 eV
Using h = 4.136 × 10⁻¹⁵ eV·s
Common Mistakes to Avoid
- ✕Confusing frequency with wavelength in calculations
- ✕Thinking intensity affects electron kinetic energy
Frequently Asked Questions
Why doesn't classical physics explain photoelectric effect?
Classical theory predicts increasing light intensity increases electron kinetic energy, but it doesn't—frequency alone matters.
What's threshold frequency?
Minimum frequency for electron emission: f_threshold = φ/h; below this, no emission regardless of intensity.
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