The Grade 11 Physics group has been making use of our latest piece of new equipment – a dual beam tube – to measure the charge to mass ratio (q/m) of electrons. Electrons are accelerated to a velocity of up to ten million metres per second, before being bent into a circular path by a magnetic field. By measuring the diameter of the circle and the current in the field coils, q/m can be determined. The path of two electron beams can be seen as orange lines in the tube, caused by the electrons striking neon atoms present at low pressure.
International School 
