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Isha Lohan posted an Question
April 19, 2020 • 12:56 pm
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30 points
30 points
- IIT JAM
- Physics (PH)
In em wave gamma (propagation constant ) is equal to real no.(x) plus complex no. (y) . then attenuation constant is real no. and in some book is complex no.
In EM wave gamma (propagation constant ) is equal to real no.(x) plus complex no. (y) . then attenuation constant is given by real no. and in some book it given by complex no. , I confused which is true ? Mathew and saiduku is given real is attenuation constant and in David j Griffith it is given that complex is atennuation constant.
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Abhishek singh Best Answer
Attenuation constant is always real number. Even in Griffith, it is stated that , "The imaginary part of complex k, results in an attenuation of wave". I think you got confused in the term "imaginary part". Always a remember, real and imaginary part of a complex number are always real numbers.(they are joined by a complex factor i (=√-1). Ask doubts if any. I have attached the picture from Griffith it self. page number 418, fourth edition, Pearson education limited. fourth line from bottom.
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sir my point is gamma = x+iy , then in Griffith he said that y is attenuation and saiduku said that x is attenuation constant . same question asked in jam , because in my university sir follow saiduku , my answer is wrong .
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I would recommend Griffith. it is standard book. Even here at IITs, we use Griffith. For attenuation y is responsible, but for determining wavelength, the propagation speed, and the index of refraction, x is responsible.
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Ruby negi![best-answer]()
hope these pages satisfy u,but I suggest u that u should follow Griffiths as bcz it is standard book and generally question paper come from it.. best regards.