MadSci Network: Physics
Query:

Subject: Why is there a vacuum inside an electron gun (or CRT)?

Date: Sun Feb 17 09:06:45 2002
Posted by John
Grade level: 10-12 School: No school entered.
City: No city entered. State/Province: Florida Country: USA
Area of science: Physics
ID: 1013954805.Ph
Message:

I read in my school physics book that there is a vacuum inside an electron gun 
(or a cathode ray tube inside TVs). But why is a vacuum needed? What would 
happen if an electron (or even a proton) beam was directed through air? Would 
air molecules interfere with the beam?


Re: Why is there a vacuum inside an electron gun (or CRT)?

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