The Schroedinger equation is a wave equation that involves a mass. This implies there are cut offs defined by nature. E$.$g$.$ the Compton wavelength. Maxwell's equations also give rise to wave equation solutions. Maxwell's equations are scale invariant as photons do not have a mass. Can you use any specific example from this course to illustrate this concept. Do not use any mathematical arguments $.$ b$)$ You have a parallel plate waveguide which modes will have a cut$-$off i$)$ TEM Mode ii$)$ TE modelling $($iii$)$ TM mode. Write the expression for atleast $1$ cutoff