# Find the deadspot from distance from the speaker

1. Nov 11, 2013

### nickb145

1. The problem statement, all variables and given/known data
You're midway between two loudspeakers producing sound with the same 83.5cm wavelength, and you experience constructive interference.

How far must you move toward one speaker in order to find a dead spot?

2. Relevant equations

3. The attempt at a solution
I have no clue what to do. I've done all the other problems on my HW just fine..but not this....
All i have is the wavelength. not sure what to do..I'm sure it's simple....probably haven't thought about it clearly..

Last edited: Nov 11, 2013
2. Nov 11, 2013

### Basic_Physics

A standing wave is set up between the 2 speakers.

3. Nov 11, 2013

### CWatters

Google for constructive and destructive interference.
Work out the conditions required for both.
Make a drawing.

4. Nov 11, 2013

### hjelmgart

At least you don't need to think about beating effects, as the waves have the same frequency. Have you worked with interference before? I am uncertain, if you can simply assume they are plane waves or not. I think sound waves are usually spherical, but perhaps you can assume, that they are plane waves, if you are far from the speakers.

http://hyperphysics.phy-astr.gsu.edu/hbase/sound/interf.html#c4