Question

The cut off wavelength and the guided wavelength are given by 0.5 and 2 units respectively. Find the wavelength of the wave. (a) 0.48 (b) 0.32 (c) 0.45 (d) 0.54 I got this question in an interview. This key question is from Phase and Group Velocity in chapter Waveguides of Electromagnetic Theory Select the correct answer from above options Electromagnetic Theory questions and answers, Electromagnetic Theory questions pdf, Electromagnetic Theory question bank, Electromagnetic Theory questions and answers pdf, mcq on Electromagnetic Theory pdf,electromagnetic theory book pdf,electromagnetic theory pdf notes,electromagnetic theory lecture notes,electromagnetic theory of light,maxwell electromagnetic theory,electromagnetic theory proposed by,electromagnetic theory engineering physics,electromagnetic theory nptel

Answer 1

The correct option is (a) 0.48 Best explanation: The cut off wavelength and the guided wavelength are related as (1/λ)^2 = (1/λc)^2 + (1/λg)^2. On substituting for λc = 0.5 and λg = 2, we get λ = 0.48 units.