Scottish Higher: Physics | Work Function

Today I will show you the formulae of the work function, this is used when energy is transmitted through photons (light particles)

E_Photon = E₀ + E_k
Energy of a photon = Energy to release + Kinetic energy
E_k = hf - hf₀
E_k = Maximum (Because it could bump into other photons) Energy
hf = Total photon energy
hf₀ = Work Function
f₀ = Minimum Frequency of light to be able to carry a charge.
h = 6.63 × 10^-34 m² kg / s

The work function is different for different metals.

Example:

The work function for a particular metal is stated as 4.90×10^-19 Joules. If a radiation of frequency 9×10¹⁴ Hz is incident on the metal, calculate the maximum kinetic energy.

E_k = hf - hf₀
E_k = 6.63×10^-34× 9×10¹⁴ × 4.9×10^-19
E_k = 1.07×10^-19

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