Na-9 Quantum Mechanical Tunnelling

Aim

To demonstrate Quantum Mechanical tunnelling with microwaves.

Apparatus

  • Microwave transmitter and receiver
  • Wax Prisms

Quantum Mechanics Tunnelling

Quantum Mechanical Tunnelling Apparatus.

Description

A microwave transmitter is directed to one face of a wax prism. A second matching prism is located close to, but separated from the first prism by about a cm making a square with a small air gap. The receiver may be moved from the direct in line position to the perpendicular receiving position. As the air gap is less than a wavelength (3cm) quantum tunnelling on a macroscopic scale occurs giving an appreciable signal in the direct line of sight position.