Na-12 Black Body Hole

Aim

To simulate a blackbody emitter and demonstrate that a blackbody is a perfect emitter.

Apparatus

  • Black body hole apparatus
  • Digital video camera with IR (night vision) mode.

Black Body Hole 1 Black Body Hole 2 Black Body 3 Black Body 4 Black Body 5

Black Body Hole Apparatus at various temperatures.

Description

The blackbody emitter consists of a carbon rod with a small 1mm blind hole in the centre. The apparatus is connected to the Lecture theatre low voltage power supply and the variac slowly increased till a current of approximately 30 Amps is produced. The video camera is focused on the centre plugged hole and the image compared in IR night vision mode and normal mode.