hi all
as you know in Milikan experiment and thomson experiment (for considering atomic structure), cathodic ray in a vacuum lamp can interact with molecules of the gas in the lamp and change them to cation by giving electron,
my questions are:
1-cathodic ray has negative charge itself how it can absorb electron (which is negative too)?
2-how Milikan and Thomson calculated q/m, I know q and m are directly related to degree of deviation of oil drops, but I can't understand how they calculated q/m ?
3- why did thomson used cathod electrod with some holes on it? what is the role of holes?