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PHYSICS - please help

 
 
Reply Thu 18 Oct, 2007 12:52 pm
the charge of one electron is -1.6x10^-19 am i correct?

so if i have a paint particle that carries 1.2 x 10^10 electrons (12000000000)what is the toatal charge it carries: i tried -1.6x10^-19 = -0.00000000000000000016 so i tried
-0.00000000000000000016 x 12000000000 electrons is this method correct? thanks
ryan
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Type: Discussion • Score: 1 • Views: 659 • Replies: 3
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Quincy
 
  1  
Reply Fri 19 Oct, 2007 08:36 am
It is correct, but not particularly good. Try this:

(-1.6x10^-9)x(1.2x10^10) = (-1.6x1.2)x(10^-9)(10^10) = -1.92x10^1= -19.2 Coulombs.

Try these websites on scientific notation:
http://www.ieer.org/clssroom/scinote.html
http://members.aol.com/profchm/sci_not.html
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arydberg
 
  1  
Reply Thu 15 Nov, 2007 08:14 am
The charge on an electron is not 10^-9 it is 10^-19 thus answer should be multipiled by 10^-10
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Quincy
 
  1  
Reply Wed 21 Nov, 2007 02:51 pm
You are correct, a small error easily corrected:

(-1.6x10^-19)x(1.2x10^10) = (-1.6x1.2)x(10^-19)(10^10) = -1.92x10^-9= -19.2x10^-8 Coulombs.
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