Question

If an ultrasound beam at the focal zone has a power of 0.050 watts and the area at this focal zone is 4cm^2, what is the intensity of the beam?

Answer 1

Oh, ultrasound
here is tutorial with this material:

https://www.cis.rit.edu/research/ultrasound/ultrasoundintro/ultraintro.html

Answer 2

Yes, all my questions are for ultrasound physics. I should've mentioned that, sorry. Thanks for the help