The de Broglie wavelength
- De Broglie proposed that electrons travel through space as a wave
- This would explain why they can exhibit behaviour such as diffraction
- He therefore suggested that electrons must also hold wave properties, such as wavelength
- This became known as the de Broglie wavelength
- However, he realised all particles can show wave-like properties, not just electrons
- So, the de Broglie wavelength can be defined as:
The wavelength associated with a moving particle
- The majority of the time, and for everyday objects travelling at normal speeds, the de Broglie wavelength is far too small for any quantum effects to be observed
- A typical electron in a metal has a de Broglie wavelength of about 10 nm
- Therefore, quantum mechanical effects will only be observable when the width of the sample is around that value