3. 2 kHz (2 kiloHertz) clock will produce clock waveforms having which of the following period values . 
Note:    M = 10^6 
         k = 10^3 
         m = 10^-3 
         u = 10^-6

  1. T = 2 us
  2. T = 5 us
  3. T = 2 ms
  4. T =.5 ms
  5. T =.5 us

4 is CORRECT. Using the formula 

T = 1/f, where f=2 KHz or 2 x10^3Hz,
results in the following order of value * prefix * unit 
T = 1/2 * 1/K * 1/Hz
  = .5  * 10^-3 * s
  = .5  *  m  * s
  = .5 ms
Also note that .5 ms is also equal to 500 us!

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