If is 0.3 for a circular wave guide operating in TM12 mode with P21=5.315, with the radius of the circular waveguide being equal to 25 mm, then the intrinsic impedance of the wave is:

If is 0.3 for a circular wave guide operating in TM12 mode with P21=

1.	If is 0.3 for a circular wave guide operating in TM12 mode with P21=5.315, with the radius of the circular waveguide being equal to 25 mm, then the intrinsic impedance of the wave is:
A.	0.55
B.	0.4
C.	0.3
D.	1.2
Answer» B. 0.4