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We know that in mechanics waves, energy is proportion to Amplitude^2.

So we can write equation as E = kA^2 , where k is a constant.

Is it possible to find this constant (k) ?

Is k different in other waves (meaning it is depended on other values) or it is constant to all mechanics waves ?

---------- About Electromagnetics waves ---------

Does "Energy proportion to Amplitude^2" also apllied to ElectroMagnetics waves ?

Is the result of photoelectric effect meaning that energy of EM waves is not proportion to amplitude but only frequency ?

Will the calculation be accurated if I calculate energy from Amplitude^2 in EM waves ?

Thank in advance.