• Support PF! Buy your school textbooks, materials and every day products Here!

How do I define a sine wave?

  • #1
Dear All,

I have an apparatus that produces a graph of results that looks to me like a sine wave (a half wave plate affecting the power throughput of a laser; it goes from maximum to minimum 4x throughout its 360º rotation). My problem is that I need to define this line as a formula but have no idea where to start. Any ideas, anyone?
 

Answers and Replies

  • #2
quasar987
Science Advisor
Homework Helper
Gold Member
4,775
8
You look at the amplitude A (maximum height) of the wave. You also find the period T on the x axis and if the wave is out of phase, you find the distance d from the origin of how much it is out of phase in the direction of positive x. Then the equation is

[tex]y(x) = Asin \left(\frac{2\pi (x-d)}{T}\right)[/tex]
 
  • #3
Thanks, Quasar987!
 

Related Threads on How do I define a sine wave?

  • Last Post
Replies
2
Views
1K
  • Last Post
Replies
6
Views
2K
  • Last Post
Replies
1
Views
972
  • Last Post
Replies
2
Views
2K
  • Last Post
Replies
6
Views
486
  • Last Post
Replies
2
Views
4K
Replies
6
Views
5K
  • Last Post
Replies
1
Views
3K
Replies
3
Views
2K
Replies
4
Views
15K
Top