Alternating quantities

Question 2 of 8

A sinusoidal voltage has a periodic time of 20ms. Its frequency will be

  1. a UHF (0.3- 3GHz)
  2. b VHF (30- 300MHz)
  3. c HF(3- 30MHz)
  4. d that of the British mains supply (50Hz)
1 2 3 4


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