I beLIEve that the equation that you are referring to is the one written below.

I=1/2p(w^2)(A^2)v

where

p = density fo the medium

w= angular frequencey or 2x(pi)xf where f= frequency

A= amplitude

v= wave velocity

So from this equation you can clearly see that the intensity is dependent on the square of the frequency for all waves.

Bonus: Frequency stays constant for all medium. However a wave may speed up or slow down depending on what medium it is traveling in. Since the below equation most hold true:

V= Wavelength x Frequency

The wavelength changes when a wave enters a new medium.

what??!?! You have to know this formula? I have NEVER seen such a thing.

Like never. Never in my life. Not in kaplan, not anywhere. Do you need to memorize this stuff??!

Btw, INTENSITY correlates with AMPLITUDE, aka the "loudness" of sound. Therefore, loudness has to do with intensity and this depends on the interference of the waves. Is it constructive or destructive?

Frequency correlates with PITCH.

That should be all you need to know. The equation you have there is ridiculous.