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2 Hydrogen (2 holes)
counting and addition and animals of the world and their habitats
Set of 12 figures and accessories including 8 different pirates
The amplifier has an internal 10W speaker that can be switched off
20 x Skipping ropes
Spark Discharge Age 3-4 2 Hydrogen (2 holes)The Spark Discharge Apparatus is an extremely visual and audible demonstration of the ionization of air caused by Alpha particles. As an Alpha source is moved along the brass mesh, Alpha particles ionize the air, causing a conductive path to form from the mesh to the conductor below, causing a shower of bright sparks and a crackling sound. Moving the source along the track clearly demonstrates that the sparks follow the source. Requires an alpha