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Plank's constant is the amount of energy a photon carries with the frequency of its electromagnetic wave. We use it whenever we solve for the energy per photon (E= frequency x plank's constant)
You use Planck's Constant(h) when finding the energy of a photon (E=hv). Based off of this equation, we know that Energy and frequency are directly proportional. If I'm not mistaken, I remember Dr. Lavelle mentioned in the Photoelectric module video that when you graph the energy of the photon against the frequency, the proportionality constant is Planck's constant. Similar to how m represents the slope in the formula y=mx, h represents the slope of the formula E=hv.
For question 9 chapter one, when we are given a frequency of 300 MHz and we want to find the energy per photon I presume we just plug it into the E=hv formula but when i do this I get 2 x 10 ^-37 which is not the write answer for E.
When calculating a photon's energy from its wavelength, you would use planck's constant. It is significant because it links the amount of energy a photon carries with the frequency of its electromagnetic wave.
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