What is the reactance of a 500pF in 1200kHz?

The reactance of a capacitor can be calculated using the formula:

Xc = 1 / (2πfC)

Where:
Xc = Reactance of the capacitor
f = Frequency in Hertz
C = Capacitance in Farads

Converting the given values:
C = 500pF = 500 * 10^(-12) F
f = 1200kHz = 1200 * 10^(3) Hz

Plugging the values into the formula:
Xc = 1 / (2π * 1200 * 10^(3) * 500 * 10^(-12))

Simplifying the expression:
Xc = 1 / (2π * 1200 * 500 * 10^(-9))
Xc = 1 / (2π * 600 * 10^(-6))
Xc = 1 / (2π * 0.0006)
Xc ≈ 265.26 ohms

Therefore, the reactance of a 500pF capacitor at a frequency of 1200kHz is approximately 265.26 ohms.