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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.
Light waves have intensity just as sound waves do. The amount of power that a light bulb uses is directly related to the intensity of the light waves that it puts out. Sound intensities given in watts per square meter can be directly compared between water and air.