amplitude v intensity

[thebillsfan]

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so is intensity related to both the square of the amplitude and the square of the frequency for all waves?

if this is the case, then with the photoelectric effect, when we say "increasing the intensity of the light will not elicit electrons if the light is below the threshold frequency"--when we we're "increasing the intensity" we're only doing so by increasing the amplitude and not the frequency? why couldnt we just as easily increase the intensity by increasing the frequency and not the amplitude, and hence increase the frequency of the light ABOVE the threshold frequency?

 

[RogueUnicorn]

if you're changing frequency you're changing energy/pitch, not intensity