Constructive or destructive interference after a set number of waves?

[kontorstol]

Homework Statement

Two sources, S1 and S2, send our circular waves that are in phase and of the same frequency. They have the same wavelength (0,5m) and the same amplitude. Will there be a maxima og a minima at the given points:

a) S1P = 5.00 m og S2P = 6.50 m?

b) S1P = 5.00 m og S2P = 4.75 m?

Homework Equations

No equations that I can find.

The Attempt at a Solution

I have tried to draw the waves from two points, but it ended up as a mess. I have tried to find some equations for finding this, but I have not found any.

If someone got the time, I would prefer a explanation, and not just an answer. Thank you. :)

 

[andrevdh]

No info on how far apart the two sources are?

 

[nrqed]

Homework Statement

Two sources, S1 and S2, send our circular waves that are in phase and of the same frequency. They have the same wavelength (0,5m) and the same amplitude. Will there be a maxima og a minima at the given points:

a) S1P = 5.00 m og S2P = 6.50 m?

b) S1P = 5.00 m og S2P = 4.75 m?

Homework Equations

No equations that I can find.

The Attempt at a Solution

I have tried to draw the waves from two points, but it ended up as a mess. I have tried to find some equations for finding this, but I have not found any.

If someone got the time, I would prefer a explanation, and not just an answer. Thank you. :)

I don't know what "o g" means :-)

I am assuming they are given the distances to the two sources. Then just look at |S1P-S2P| which is the path difference and see how many wavelengths fit in those intervals. This leads to the answer.