Question
Electronic Devices Question on Semiconductor electronics: materials, devices and simple circuits
An evanescent mode occurs when
A
a wave is attenuated rather than propagated
B
m=n=0 so that all field components vanish
C
the propagation constant is purely imaginary
D
the wave frequency is same as the cut-off frequency
Answer
a wave is attenuated rather than propagated
Explanation
Solution
The Correct answer is option (A) : a wave is attenuated rather than propagated