1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Vaccum physics JJ Thomson's experiment

  1. Dec 30, 2012 #1
    Why did JJ Thomson need to inprove the vacuum in his cathode ray tube?
    how to approximately calculate the pressure if one want to do thomson's electric field deflection experiment?
    thank you all!!
  2. jcsd
  3. Dec 30, 2012 #2


    User Avatar
    Staff Emeritus
    Science Advisor

    I'd guess that the vacuum wasn't good enough and the electrons kept colliding with air molecules.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook