Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Cant understand this line in the book(semiconductor nightmare 4)

  1. Mar 20, 2010 #1

    nhrock3

    User Avatar

    2v3mnpx.jpg
    in the marked red line
    how they comeup with the fact the the velocity increases by this amount
    ?
    i didnt see this expression before in this book
     
    nhrock3, Mar 20, 2010
  2. jcsd
    Phys.org - latest science and technology news stories on Phys.org
  3. Mar 20, 2010 #2

    tiny-tim

    User Avatar
    Science Advisor
    Homework Helper

    Hi nhrock3! :smile:

    F = ma = m(dv/dt) …

    In this case, F = qE = -eE, so m(dv/dt) = qE, so ∆v = -eEt/m. :wink:
     
    tiny-tim, Mar 20, 2010
  4. Mar 20, 2010 #3

    nhrock3

    User Avatar

    thanks :)
     
    nhrock3, Mar 20, 2010
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook