- #1
Comael321
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Homework Statement
When a camera flashes, the batteries begin recharging the flash capacitor which stores the charge Q according to the function Q(t) = Q* (1-e-t/a) where t is the elapsed time in seconds since the camera flash and Q* and a are non-zero
(a) What does Q* represent?
(b) Find the inverse of this function
(c) How long does it take to recharge the capacitor to 90% if a = 5?
Homework Equations
The Attempt at a Solution
I said that Q* was the constant of proportionality, but I'm not sure how right that is.
My attempt at the inverse came out as t*a/ln(Q*) = Q
I'm wondering if my answer for (a) is at all correct, and where to go from here, I have no idea how to attempt (c) and I think my answer to (b) is wrong.