Kinetic Energy of a Photoelectron

📊 intermediate

$$eV_s = hf - \Phi$$

Relates stopping potential to the incident photon frequency and work function.

Variables & Units

$V_s$

Stopping potential

Unit: Volt ($V$)

$e$

Elementary charge

Unit: $1.6 \times 10^{-19} C$

$f$

Frequency of light

Unit: Hertz ($Hz$)

$\Phi$

Work function

Unit: Joule ($J$)

Key Information

📐 Derived From

Einstein's photoelectric equation.

💡 Example

Determining $h$ experimentally using different light frequencies.

🔧 Applications

Photomultiplier tubes and solar cells.

⚠️ Constraints

Surface must be clean and monochromatic light used.

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