# Alternating quantities

### Explanation of question 2

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

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

The answer is :- 4 F = 1/t = 1/0.02 = 50Hz

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