# Propagation

### Explanation of question 22

Critical frequency is defined as

1. the highest frequency returned to earth when radiation is vertically upwards
2. the maximum frequency reflected by the ionosphere
3. that frequency at the end of a particular frequency band
4. the lowest frequency that will radiate from an antenna

The answer is :- 1 The definition of critical frequency is the highest frequency returned to earth when radiation is vertically upwards.

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