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The period T is the time for one complete cycle of an oscillation of a wave. The frequency f is the number of periods per unit time (per second) and is measured in Hz, or cycles per second. These are related by:

f = 1/T

Therefore, for a period of T = 20µs = 20*(10^-9)s,

f = 1/(20*(10^-9))

f = 20*(10^9)

f = 20,000,000,000 Hz = 20 GHz.

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