The critical frequency of an ionosphere layer is 10 MHz. What is the maximum launching angle from the horizon for which a 20 MHz wave will be reflected by the layer

The critical frequency of an ionosphere layer is 10 MHz. What is the m

1.	The critical frequency of an ionosphere layer is 10 MHz. What is the maximum launching angle from the horizon for which a 20 MHz wave will be reflected by the layer
A.	0
B.	30
C.	60
D.	90
Answer» C. 60

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The critical frequency of an ionosphere layer is 10 MHz. What is the maximum launching angle from the horizon for which a 20 MHz wave will be reflected by the layer

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