If wave of critical frequency 30 MHz is departing an angle

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If wave of critical frequency 30 MHz is departing an angle of 60º then the MUF is given to be—

1. 10 MHz
2. 15 MHz
3. 30 MHz
4. 60 MHz

Correct Option: D

We have relation of maximum usable frequency
f_muf = f_c sec i

=	f_c	=	30 MHz	= 60 MHz
	cos i		cos 60