Finding the first nodal line from two point sources

[Physicsisfun2005]

I am having difficulty grasping what to do for this problem:

Two point sources located (0, +/- 2.5(lambda)) are generating waves in phase. Compute the distance from the x-axis to the first nodal line at
x=50(lambda)


I'm not sure what equations to use. My physics instructor is terrible and we don't even use a textbook...instead we have to read his "readings". I don't really grasp wave motion very well.....if u have a link to a wesite that can help be out that would be great.

Thanks!

 

[xanthym]

I am having difficulty grasping what to do for this problem:

Two point sources located (0, +/- 2.5(lambda)) are generating waves in phase. Compute the distance from the x-axis to the first nodal line at
x=50(lambda)

The distance "Y" off the x-axis at the point x=(L) where the first nodal line (i.e., the first minimum) occurs is given by:
Y = L*(1/2)*λ/d
where "λ" is the wavelength, and "d" the distance between the 2 sources. Using {L = 50λ} and {d = 2*(2.5λ) = 5λ}, we get:
Y = (50λ)*(1/2)*(λ)/(5λ) = (5λ)

For more information regarding this subject, try the following web site:
http://www.glenbrook.k12.il.us/gbssci/phys/Class/light/u12l3c.html


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[Physicsisfun2005]

excellent.....thank you!