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Mathematical significance of EV
First of all, the units in your frequency calculation are wrong. The unit of h is eV times s.

C is the speed of light, generally 3.0×10.8m/s,

hc= 1.24× 10^(-6)eVm

Just multiply it directly by the unit here. It should be noted that eV is an energy unit, but it is not in the international system of units.

Hz represents the number of times per unit time, and its unit is actually the same as1/s.

It is best to take units in each calculation process.

You can use units to quickly verify the correctness of the calculation. This can help you understand the concept of "dimension". If the size is wrong, there must be something wrong with the calculation process.