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How do we measure intensity? In the book on page 4, it says intensity is the square of the altitude. However, the above response defines intensity as the number of photons. Then on page 9, the Stefan-Boltzmann law is explained. How am I supposed to relate all this information?
In typical waves, intensity is measured as an increase in amplitude. Amplitude is the height of the waves, or the distance of the crests and troughs of waves from the midpoint or node. However, because light functions as a wave and proton, the amplitude does nothing to increase the amount of energy that the photon is carrying because it transfers energy in quanta.
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