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Acylindrical waveguide with radius of 3.5 cm has waves travelling in $$TM_{12}$$ mode. The value of $$1^{st}$$ zero of $$2^{nd}$$ order Bessel function is 7. Find the cut-off wavelength for this mode.
$$\pi$$ cm
$$1.5 \pi$$ cm
$$2 \pi$$ cm
$$\frac{\pi}{2}$$ cm
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