Question

The group delay of a wave with phase constant 2.5 units and frequency of 1.2 radian/sec is

(a) 3.7

(b) 1.3

(c) 3

(d) 2.08

The question was asked in an international level competition.

My doubt is from S and P Polarised Waves topic in chapter EM Wave Propagation of Electromagnetic Theory

Answer 1

Right answer is (d) 2.08

For explanation: The group delay is given by td = β/ω. On substituting for β = 2.5 and ω = 1.2, we get the group delay as td = 2.5/1.2 = 2.08 units.