Question

Choose the correct statements
For a wave propagating in an air filled rectangular waveguide

Answer 1

Ans : (a & c)

${\lambda }_g=\frac{\lambda }{\sqrt{1-{\left(\frac{f_c}{f}\right)}^2}}$

${\lambda }_g>\lambda$

${\eta }_{TE}=\frac{{\eta }_0}{\sqrt{1-{\left(\frac{f_c}{f}\right)}^2}}$

${\eta }_{TE}>{\eta }_0$

${\eta }_{TM}={\eta }_0\sqrt{1-{\left(\frac{f_c}{f}\right)}^2}$

${\eta }_{TM}<{\eta }_0$

$v_p=\frac{\omega }{\beta }=\frac{1}{\sqrt{\mu ϵ}}=\frac{C}{\sqrt{{\mu }_r{ϵ}_r}\sqrt{1-{\left(\frac{f_c}{f}\right)}^2}}$

$v_p>c$