# Understanding phase difference

1. Jan 17, 2010

### kavamo

1. The problem statement, all variables and given/known data

Two waves with identical frequency but different amplitudes A1 = 6.0 cm and A2 = 2.0 cm, occupy the same region of space (are superimposed).

(a) At what phase difference does the resulting wave have the largest amplitude?

2. Relevant equations

I have found the amplitude of the resulting wave (8.0 cm) which was the second part of the problem) but am not sure how to calculate the phase difference. The formula in my books is:

d1-d2/lamda(wavelength)

3. The attempt at a solution

The problem is I don't know/understand how to solve for the distances. Can anyone point me in the right direction?

Thanks.
1. The problem statement, all variables and given/known data

2. Relevant equations

3. The attempt at a solution

2. Jan 18, 2010

### rl.bhat

Resultant amplitude is maximum when the phase difference is 2*n*pi, where n = 0, 1, 2, ..etc.

3. Jan 18, 2010

### kavamo

Thank you for the assist.

kavamo