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Originally Posted by N0B0DY  Does it mean that a change in amplitude will produce a change in frequency?
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With reference to my poor physics knowledge, amplitude is a y-variable or called an depend variable. Frequency/wavelength is a x-variable or called independent variable.
For an EM wave in vacuum without red/blue shift, the curve of amplitude is always sinuous.
That means, usually, amplitude is decided by x-valves (position in a sine curve). Maximum amplitude is thus one forth of a wave length.
Mathematically speaking, from the max amplitude, we can calculate back the wavelength. But seems unable to say that amplitude determines/affects its wavelength.
The square of an amplitude is correlated to its intensity. In a quantum wave, it is the probability of being found locating there.
For the emission of radio em waves, it seems that the higher the amplitude, the more powerful, the more photons sending out. But the energy of each photon is still solely depends on its frequency, not amplitude.
(Amplitude tells us the group numbers of photons per unit volume).
Correct me if I am wrong. I no longer remember my high school physics well.
Best Regards. Bottomlander