A radiowave is incident on a layer of ionosphere at an angle of 30 degree with the vertical common. If the critical frequency is 1.2 MHz the maximum usable frequency is

A radiowave is incident on a layer of ionosphere at an angle of 30 deg

1.	A radiowave is incident on a layer of ionosphere at an angle of 30 degree with the vertical common. If the critical frequency is 1.2 MHz the maximum usable frequency is
A.	1.2 MHz
B.	2.4 MHz
C.	0.6 MHz
D.	1.386 MHz
Answer» E.

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A radiowave is incident on a layer of ionosphere at an angle of 30 degree with the vertical common. If the critical frequency is 1.2 MHz the maximum usable frequency is

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