### PhotoElectric Effect Equations

### Equation to convert frequency to energy.

**E** : energy of photon, units J
**h** : this is Planks constant.

value of 6,63 x 10^{-34} J.s
**f** : frequency f the light , units Hz

### Equation to convert period T to frequency.

**T**: period, measured in seconds

### Equation to convert wavelength to frequency

**c** : speed of light, units m.s^{-1}

constant value of 3 x 10^{8}
**λ** : wavelength, measured in meters

### Photoelectric Equation

**E** : energy of the photon
**W**_{0} : work function of the metal
**E**_{k(max)} : kinetic energy of the photoelectrons

### Mass of an electron m_{e} and Kinetic Energy

The mass of an electron is:

You would need this mass if you wanted to calculate the actual speed of a photoelectron from kinetic energy :