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Hey! Just adding onto what was stated previously, Max Planck was trying to show that when energy is being exchanged, it occurs in "packets" of energy. This constant helps to show that given the frequency of a wave, it can only carry a certain amount of energy.
Planck’s constant defines the amount of energy that a photon can carry, depending on the frequency of the wave in which it travels. Planck first attempted to reproduce the expression for entropy of an ideal oscillator related to the black body radiation law. The classical theory predicted that a body would radiate an infinite amount of power. Planck found that by assuming the mode excitations were quantized, he received a convergent answer.
To add on to what everyone else in the thread has already stated, planck's constant is used to relate the frequency of a wave to the energy of a photon. It was calculated by measuring the relationship between the two. It turned out that the frequency and the energy of the photon were directly proportional!!! This is why the relationship can easily be described using the linear equation of y=mx+b. (m would be planck's constant!!!)
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