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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.
So the energy of light depends on both intensity and wavelength. To sum up, you now know a lot about waves and light: 1  How to measure wavelength. 2  That light wavelengths are often measured in units of angstroms. 3  That different wavelengths of light have different energies.nergy is a positive quantity, so the amplitude is a positive number. However... Scientists don't usually talk about the amplitude of a light wave, since light isn't traveling in some substance like water or air.