What are the period and frequency of electromagnetic oscillations in the oscillatory circuit, if the capacitance

What are the period and frequency of electromagnetic oscillations in the oscillatory circuit, if the capacitance of the capacitor is 4 • 10 ^ 3 μF, and the inductance of the coil is 9 * 10 ^ 5 H?

Decision:
T = 2 * 3.14 * √3 * 9 * 10 ^ -9 * 10 ^ -5;
T = 6.28 * 5.2 * 10 ^ -7 = 3.27 μs
v = 1 / (3.27 * 10 ^ -6) = 305,810.4 Hz
Answer: 3.27 μs; 305,810.4 Hz