Answer to Question 4

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(a) The x-axis intercept represents where the discharge reaches 1.0 V (ln 1 = 0).

Use the equation:

(1.0 V 6.0 V) = e-t/22s

Taking natural logs:

0 - ln (6.0) = - t 22 s  (minus signs cancel out)

t = 1.792 22 s = 39.4 s

This is consistent with the x-axis intercept.