22. In an air-filled parallel-plate waveguide with dimension a = 4 cm, according to the expression of electric field distribution,
E= E₀(sin25πx+3sin50πx)sin(8x10⁹πt)
What is the value of phase constantβ₂ of propagation wave?
(A) 7.5
(B) 23.5
(C) 29.2
(D) 74 radm

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