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The reason E = hv is that h is joule second and v is cycles divided by seconds. Since cycles have no dimension you can simply cancel out the unit of seconds in the numerator and denominator leaving the dimension of the answer as joules. Note that cancelling a unit has no effect on the values in the equation. This is what we use dimensional analysis for. I have explained this in words rather than just using maths since that is how you requested answers.
The unit for h is actually Joule second per cycle.
The SI units are defined in such a way that, when the Planck constant is expressed in SI units, it has the exact value h = 6.62607015?10−34 J⋅Hz−1
Quote from: hamdani yusuf on 14/01/2024 07:12:56The unit for h is actually Joule second per cycle.Er, no. QuoteThe SI units are defined in such a way that, when the Planck constant is expressed in SI units, it has the exact value h = 6.62607015?10−34 J⋅Hz−1 Since 1 Hz = 1/second, the term Hz-1 has the dimension of time, so h is simply 6.62607015?10−34 joule.sec.h/2π = ħ is still joule.sec but 2π turns up in so many calculations that it is simply a more compact way of writing equations.
The hertz (symbol: Hz) is the unit of frequency in the International System of Units (SI), equivalent to one event (or cycle) per second.https://en.wikipedia.org/wiki/Hertz
Photons are not rotating, so radians are not involved. How many radians in a square wave? Or a piano string?
I never forget Fourier, but photons and pianos have never heard of him. Hammond organs and power stations use a rotating shaft to generate various frequencies.