# Propagation

### Explanation of question 6

The frequency band 300- 3000MHz is known as

1. high frequency (HF)
2. very high frequency (VHF)
3. ultra high frequency (UHF)
4. super high frequency (SHF)

The answer is :- 3

The number to remember is ‘3’, and the steps ‘times 10’, i.e.

low frequency | (l.f.) | 30-300 kHz
medium frequency | (m.f.) | 300-3000 kHz> (0.3-3MHz)
high frequency | (h.f.) | 3-30 MHz
very high frequency | (v.h.f.) | 30-300 MHz
ultra high frequency | (u.h.f.) | 300-3000 MHz (O.3-3GHz)
super high frequency | (s.h.f.) | 3-30 GHz

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