ACTIVITY 1
Go through the following explanation on the working of a diffusion cloud chamber and answer the questions that follow.
The diffusion cloud chamber
This chamber is simplified as shown below;
The bottom of the chamber is cooled by solid carbon (V) oxide to around -800 C and the alcohol vapour from the felt ring spreads downwards. It is cooled below its normal condensing temperature. As a particle enters the chamber, it ionizes the air in its path and alcohol condenses around the path to form millions of tiny alcohol droplets leaving a trail visible because it reflects light from the source. Alpha particles leave a thick, short straight tracks. Beta particles leave thin irregular tracks. Gamma particles do not produce tracks and since they eject electrons from atoms the tracks are similar to those of beta particles.
ACTIVITY 2
Watch the video below on the working of cloud chamber and answer the question in the Evaluation section.