The wavelength is illustrated by the image below.

To compute for wavelength, three essential parameters are needed and these parameters are **Planck’s Constant (h), Speed of Light (c)** and **Energy Gap (E _{g}).**

The formula for calculating wavelength:

λ = ^{hc}/_{Eg}

Where:

λ = Wavelength (Eg)

h = Planck’s Constant

c = Speed of Light

E_{g} = Energy Gap

Given an example;

Find the wavelength when the planck’s constant is 6.626E-24, the speed of light is 3E8 and the energy gap is 24.

This implies that;

h = Planck’s Constant = 6.626E-24

c = Speed of Light = 3E8

E_{g} = Energy Gap = 24

λ = ^{hc}/_{Eg}

λ = ^{(6.62607004e-24)(300000000)}/_{24}

λ = ^{1.987821012e-15}/_{24}

λ = 8.28e-17

Therefore, the **wavelength **is **8.28e-17m.**