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!

Rise/Fall Time Sine Wave

  1. Jan 31, 2007 #1
    Does anyone remember the formula for the rise/fall time for a sine wave...?

    I thought I could calculate it but I did it wrong apparently
    [tex]V_o sin(2*\pi*f*t)=.1 V_o [/tex]

    [tex]\frac{arcsin(.1)}{2 \pi f} [/tex]

    [tex]V_o sin(2*\pi*f*t)=.9 V_o [/tex]

    [tex]\frac{arcsin(.9)}{2 \pi f} [/tex]

    but that isn't right
    Last edited: Jan 31, 2007
  2. jcsd
  3. Jan 31, 2007 #2
    Ahhh would I just have to change .1 and .9 to
    .2 and .8
  4. Jan 31, 2007 #3


    User Avatar
    Staff Emeritus
    Science Advisor

    What, exactly, do you mean by "rise and fall time". The period of the sine function, sin(x), is [itex]2\pi[/itex]- that's the "time" for an entire cycle. If, by "rise and fall" time, you mean the time for the function to go up to its highest value and then back to 0, that would be 1/2of that, [itex]\pi[/itex]. Or, you might mean the time to rise and the time to fall. Each of those would be [itex]\pi/2[/itex].

    Of course, then, I have no idea where you got the "0.1" and "0.9". Or even "0.2" and "0.8"!
  5. Feb 6, 2007 #4
    how is time in radians ? its just the time period i suppose. And shouldnt the time for rise and fall depend upon wave velocity or wavelength ?
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?

Similar Discussions: Rise/Fall Time Sine Wave
  1. Addition of sine waves (Replies: 28)