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!

Goniometers and Standing Waves

  1. Sep 23, 2015 #1
    1. The problem statement, all variables and given/known data
    Initially your receiver is positioned at a distance of 8.4 cm from the goniometer and recording a maximum intensity. You move it through 10 minimums in the intensity and then stop at the next maximum intensity. The receiver is now a distance of 27.3 cm from the goniometer.

    What is the wavelength of the signal you have measured?

    2. Relevant equations
    ƛ/2=Distance between two maximums


    3. The attempt at a solution
    ƛ=2(27.3-8.4)cm
    =37.8cm

    It's that simple right?
    I keep getting the wrong answer with this. What am I missing?
     
  2. jcsd
  3. Sep 24, 2015 #2

    haruspex

    User Avatar
    Science Advisor
    Homework Helper
    Gold Member
    2016 Award

    You are not taking into account that it was moved through many minima and maxima. You have calculated as though it was moved to the very next maximum.
     
  4. Sep 24, 2015 #3
    The wording in the question confused me. So you are saying that between each of the 10 minimums there was a maximum as well?
     
  5. Sep 24, 2015 #4

    haruspex

    User Avatar
    Science Advisor
    Homework Helper
    Gold Member
    2016 Award

    That's the usual arrangement.
     
  6. Sep 24, 2015 #5
    SO there are 5 complete wavelengths.

    Therefore ƛ=(27.3-8.4)/5 cm
     
  7. Sep 24, 2015 #6

    haruspex

    User Avatar
    Science Advisor
    Homework Helper
    Gold Member
    2016 Award

    That looks better.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted



Similar Discussions: Goniometers and Standing Waves
  1. Standing Wave (Replies: 1)

  2. Standing Wave (Replies: 2)

  3. Standing waves (Replies: 3)

  4. Standing Waves (Replies: 0)

  5. Standing waves (Replies: 2)

Loading...