This is probably the most annoying thing about physics. Those are both formulas written on my formula sheet and driving me freaking batty for a few minutes before I realize....
momentum (p) = mass (m) x velocity (v)
density (p) = mass (m) / volume (v)
COME UP WITH DIFFERENT VARIABLES!
Oh lamda? That lovely greek letter. Are you talking about wavelength or decay constant? Is that a capital C or a lowercase c? Because one means Coulombs (unit of charge) and the other is the speed of light.
God I hate you.
Guess what I'm studying right now?