I'm completing study for PPD and wish I'd known this at the beginning, so I hope this is helpful to others...
Learn the Inverse Square Law because it's a basic physics principle used in Acoustics and Lighting.
I like this web source for explanation:
I find it easier to retain knowledge if I understand the actual physics and then how it is applied in areas which are of concern to me (acoustics and lighting). Maybe you're like me and this will be helpful to you.
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