1. Not finding help here? Sign up for a free 30min 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!

Finding the time constant

  1. Sep 23, 2012 #1
    1. The problem statement, all variables and given/known data
    Find the time constant
    [itex] x(t)=4 e^{-4t} u(t)[/itex]

    2. Relevant equations
    [itex] \tau = \frac{1}{\lambda} [/itex]


    3. The attempt at a solution
    [itex] \tau = \frac{1}{\lambda}= \frac{1}{4} = .25 [/itex]

    I know the unit step is shifting the start of the decay function to zero, but I'm not sure how or if this can affect the time constant. So my question is how does the unit step affect the time constant?
     
  2. jcsd
  3. Sep 23, 2012 #2

    Ray Vickson

    User Avatar
    Science Advisor
    Homework Helper

    It has no effect. Just recall the definition of time constant.

    RGV
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: Finding the time constant
  1. Time constant question (Replies: 4)

Loading...