Capacitors and resonant frequency

I have a problem that asks about the movement of the second plate of a
capacitor in order to change the resonant frequency by 10 ppm in an LC
circuit. I am getting stuck in terminology.

Here is the information given:

Area of each capacitor plate (one attached to solid nonmoving post while
other can move small distances perpendicular to the plates)
..01 m^2

Initial plate separation
100 micometers

Inductance
120 nH

I have found the initial capacitance and frequency, but the second part of
the question says "How far must the second plate move to change the resonant
frequency by 10ppm". I am not entirely sure what this question is asking
for. Where does ppm fit into any of the calculations. I don't want
answers, but I would appreciate if somebody can translate the question into
something I might understand.



.

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