Question

why does beta rays deviate more than alpha

Answer 1

Beta particles are attracted to the positively charged plate. This confirms that they are negatively charged. Beta particles are fast moving electrons with a very low mass and so have a high charge to mass density. They are deflected much more than the heavier alphaparticles.

Answer 2

Beta particles are attracted to positively charged plate.This confirms that Beta rays are negatively charged.beta partices are fast moving with low mass and high charge to mass density. they are deflected much more than the heavier alpha particles.