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## Homework Statement

Hi all.

I have two loudspeakers placed on the x-axis at -L and L respectively. Now I have found the resulting wave at a point z

_{0}on the z-axis. I've used the superposition-principle, and I've arrived at the following expression:

[tex]

\widetilde f(\overrightarrow r ,t) = 2A\exp \left[ {i\left( {\frac{{\alpha \left( {\left( {x + y} \right) + \left( {x - y} \right)} \right)}}{2} - \omega t} \right)} \right]\cos \left( {\alpha \frac{{\left( {\left( {x + y} \right) - \left( {x - y} \right)} \right)}}{2}} \right)

[/tex]

where the tilde over f indicates that it is complex.

**Question:**What part of the expression for f is the ampltitude? Is it only 2A, or is it the expontential term

**and**2A the ampltitude?

Thanks in advance.

Regards,

Niles.