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Like Taryn said, we use it to find energy/photon, substitute it in the rydberg equation (the equation used to find frequency, energy,et.c. of light when electrons go up/down quantum levels) & c=v(wavelength. it's used a lot; besides c=v(wavelength) I think it's probably one of the most commonly used (especially since we're talking about photons/electrons a lot) :)
E = hv is used in general to find the energy of a photon, although it can also be interpreted to find the energy required to remove an electron. On the topic of quantum, E = hv is most likely going to be a major equation.
Sean1F wrote:How often would you have to rearrange this equation to find other quantities? Should this be practiced?
The rearrangment of this equation would be most likely to find the energy required to remove an electron, or finding the wavelength of a photon/electron. It should be practiced as I believe finding these two quantities will also be common on the topic of quantum.
When relating energy of a photon to frequency, we use Einsteins equation. And if kinetic energy=0, we can also use it for the energy required to remove an electron. So, E = hv is used for relating the energy of a photon to its frequency, (remember that energy of a photon and its frequency are directly proportional)
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