[miguel_91]

Hi, my first message  I hope to be replied  . (By the way sorry for my bad English)

Well I need an explication about how did Thomson guess the mass of an atom by comparing it with the Hydrogen and using cathode rays.

[cliverlong]

I have only skim read, but Thomson's own Nobel lecture of 1906 contains information on charge mass ratio of electrons (called corpuscles by Thomson) which, combined with other data led him to a mass for the hydrogen atom / ion.

http://nobelprize.org/nobel_prizes/physics/laureates/1906/thomson-lecture.html

You will see he didn't guess the mass. He measured, used other data, had a theory, then calculated.


Clive

[miguel_91]

Thank you I got it by reading an article about charge mass ratio. =)