Purpose:Demonstrate standing waves using radio waves.
Description:This demonstration uses a simple low-power RF transmitter with vacuum tubes, of a type developed by P. E. Klopsteg. A handheld dipole antenna with an indicator lightbulb at the center serves as the receiver.
Set transmitter so that the antenna is parallel to the blackboard. (The blackboard is made of a painted metal sheet.) Hold the receiving antenna parallel to the transmitting antenna between you and the transmitter, and walk up the steps in the lecture hall. The bulb will produce maximum glow about every two meters, illustrating standing waves.
This demonstration is only usable in classrooms PHY1410 and 1412.