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So using the standard equation: E = hf, we can find the relationship between light intensity and wavelength as follows: c = lambda x f Therefore, f = c/lambda substitute this in the standard equation to get: E = (h c)/lambda Where h = planks constant, and c = speed of light.
Intensity is proportional to the square of the amplitude. So if amplitude is squared, intensity is quadrupled. Intensity varies in diagnostic ultrasound because it's highest at the center of the beam and falls off near the periphery. It also varies along direction of travel due to focusing and attenuation.