J.J. Thomson's cathode ray experiment


by jcortez91
Tags: cathode, experiment, thomson
jcortez91
jcortez91 is offline
#1
May6-12, 01:49 PM
P: 6
In Rohlf's Modern Physics textbook it reads: "The value of q/m for the electron determined by Thomson wan substantially smaller than the values of q/m determined by electrolysis, that is, q/m for the electron is much smaller than for ionized atoms. There were two extreme possibilities: (1) The electron charge is much smaller than the charge of an ionized atom, or (2) the electron mass is much smaller than the mass of an ionized atom (or both!) " (Rohlf 12).

Of course we know the mass to be much smaller but is the book description correct? It seems to me that m/q should be smaller for electrons, not q/m, because either the mass is smaller or the charge is larger. Could someone shed light on this?


Thanks,
Alex
Phys.Org News Partner Physics news on Phys.org
The hemihelix: Scientists discover a new shape using rubber bands (w/ video)
Mapping the road to quantum gravity
Chameleon crystals could enable active camouflage (w/ video)
haruspex
haruspex is offline
#2
May6-12, 06:27 PM
Homework
Sci Advisor
HW Helper
Thanks ∞
P: 9,215
Looks like Rohlf has it backwards - good catch.
The confusion may arise because some refer to m/q and some to q/m.
jcortez91
jcortez91 is offline
#3
May6-12, 08:27 PM
P: 6
Okay thanks. It was bugging me.


Register to reply

Related Discussions
J.J. Thomson's Experiment, Help! Calculus & Beyond Homework 2
J.J. Thomson's m/e Experiment, Help! Calculus & Beyond Homework 2
Why J.J Thomson use gold in his experiment for atomic model? High Energy, Nuclear, Particle Physics 10
In an experiment similar to Thomson's... Introductory Physics Homework 0
Deflection and Magnetic Fields in Thomson's Experiment Advanced Physics Homework 0