- #1
Demian^^
- 8
- 0
I'm working on a project that involves 'acoustic radiation pressure'.. This means that an acoustic wave can exert a net force on some object, along it's propagation-direction.. if the object was a plate, it would look somewhat like this:
...... |
----||--wave--> |->Force
...... |
..... plate
This force is quite small.
I don't, however, understand the reason this force can exist.. it's presumably a change of momentum of the air-molecules or so..
The net pressure (time averaged) exerted on the plate in the above situation would be I/c if the plate was absorbing and 2*I/c if the plate was reflecting.. (I = intensity, c= speed of sound). I found these formulas somewhere, without any explanation accompanyin them.
Is there anyone that could give me a step in the right direction to explain this?
...... |
----||--wave--> |->Force
...... |
..... plate
This force is quite small.
I don't, however, understand the reason this force can exist.. it's presumably a change of momentum of the air-molecules or so..
The net pressure (time averaged) exerted on the plate in the above situation would be I/c if the plate was absorbing and 2*I/c if the plate was reflecting.. (I = intensity, c= speed of sound). I found these formulas somewhere, without any explanation accompanyin them.
Is there anyone that could give me a step in the right direction to explain this?