如何计算Photoelectric
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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.
公式
The calculator applies KE_max = hf - φ
分步指南
- 1Enter photon frequency and material's work function
- 2The calculator applies KE_max = hf - φ
- 3Results show maximum electron kinetic energy
例题解析
输入
f = 6 × 10¹⁴ Hz, φ = 2 eV
结果
KE_max = 2.48 - 2 = 0.48 eV
Using h = 4.136 × 10⁻¹⁵ eV·s
常见错误注意事项
- ✕Confusing frequency with wavelength in calculations
- ✕Thinking intensity affects electron kinetic energy
常见问题
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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