The SI unit of propagation constant \( k \) is (a) \( \mathrm{rad} \mathrm{m}^{-1} \) (b) \( \ma...

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The SI unit of propagation constant \( k \) is
(a) \( \mathrm{rad} \mathrm{m}^{-1} \)
(b) \( \mathrm{m} \mathrm{rad}^{-1} \)
(c) \( \operatorname{rad~m} \)
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