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These variables are h for Planck's constant (6.6.26 x 10^-34) and v for frequency. The v for frequency can also be seen in c=(wavelength)(v). With the only terms in E=hv being a constant and v, we see how it does not matter the intensity of the light but only the frequency. This goes back to Dr. Lavelle's analogy about the cross country runners and the barrier. Hope this helps :)
h stands for the plank constant and the v stands for the frequency. You can also, if you need to find the wavelength, use the frequency (v) and rewrite it as c/wavelength. This will get you E=hc/wavelength. C is the speed of light in the vacuum which is a constant and it is 3.00*10^8
Adding on to this question, is there a specific way we should be writing the "v" or frequency in the equation E = hv? Every lecture I get a bit confused because the symbol for frequency looks exactly like "v" for velocity and i'm not too sure how to make a distinction.
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