# Sound interference

1. Jan 11, 2014

### jaumzaum

I cannot understand the following:

Imagine you have 2 sound sources and build up an interference experiment, where far away from the sources you have a receptor. Imagine you put the receptor at the same distance from the sources. If you turn off one source the receptor will receive a sound of intensity I, if you turn both on the intensity will be 4I, why is that? I can understand that for the light experiment, as the intensity depends on the square of the electric field, but how can I expain that for the sound?

2. Jan 11, 2014

### Simon Bridge

What is the relationship between intensity and amplitude for sound?

3. Jan 11, 2014

### jaumzaum

I don't know :(
Is there a physical formula that relates the amplitude with the intensity?

4. Jan 11, 2014