# Sound wave relative minima help

1. Feb 7, 2006

### jesuslovesu

Two speakers are drive by a common oscillator at 800 Hz and face each other a distance of 1.25 m. Locate the points along a line joining the two speakers where relative minima would be expected (v =343m/s speed of sound)

How would I do this? I think I would just take part of the wavelength but how do you know which parts?

2. Feb 7, 2006

### Chi Meson

Consider the problem visually, as though you could see the waves (picture transverse waves). How long are the wavelengths? And what would you expect to happen at the exact midpoint between the speakers?(At this point the waves from the two sources have travelled exactly the same distance to get to the point, so what kind of interference?)

3. Feb 18, 2006

### gandharva_23

maxima will be observed at all the points where the path difference between the waves is zeo . the perpendicular bisector of the 2 sources will be the locus of the points where maximum sound is observed .

4. Feb 18, 2006

### nrqed

First, the question is about *minima*. Second, maxima occur when the path difference is zero or any multiple of the wavelength. Third, the question is about point along the line joining the two sources!!