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## Homework Statement

a spherical sound wave source at the origin emits a sound wave with frequency 13100Hz and a wave speed of 346m/s. what is the phase difference in degrees and radians between the two points with (x,y,z) co-ords (1cm,3cm,2cm) and (-1cm,1.5cm,2.5cm)??

## Homework Equations

v=f[tex]\lambda[/tex]

[tex]\Delta\phi[/tex]=2[tex]\pi[/tex][tex]\Delta[/tex]x/[tex]\lambda[/tex]

## The Attempt at a Solution

[tex]\lambda[/tex]=v/f=346/13100=26.4x10^-3m

[tex]\Delta[/tex][tex]\phi[/tex]=2[tex]\pi[/tex](.01--.01)/[tex]\lambda[/tex]=

2[tex]\pi[/tex](.02)/26.4x10^-3=4.76rad=272.6degrees

i know this question seems simple but is it really just that, it doesnt seem right????

what about the x,y,z co-ords, y tell me them?????? plz does anyone have any idea??